Orders of magnitude (numbers)

This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantities and probabilities. Each number is given a name in the short scale, which is used in English-speaking countries, as well as a name in the long scale, which is used in some of the countries that do not have English as their national language.

Smaller than 10⁻¹⁰⁰ (one googolth)

Physics: The probability of a human spontaneously teleporting 50 kilometres (31 miles) due to quantum effects is approximately 10^{−4.5×10²⁹}.^[1]
Mathematics – random selections: Approximately 10^−183,800 is a rough first estimate of the probability that a typing "monkey", or an English-illiterate typing robot, when placed in front of a typewriter, will type out William Shakespeare's play Hamlet as its first set of inputs, on the precondition it typed the needed number of characters.^[2] However, demanding correct punctuation, capitalization, and spacing, the probability falls to around 10^−360,783.^[3]
Computing: 2.2×10⁻⁷⁸⁹¹³ is approximately equal to the smallest non-zero value that can be represented by an octuple-precision IEEE floating-point value.
- 1×10⁻⁶¹⁷⁶ is equal to the smallest non-zero value that can be represented by a quadruple-precision IEEE decimal floating-point value.
- 6.5×10⁻⁴⁹⁶⁶ is approximately equal to the smallest non-zero value that can be represented by a quadruple-precision IEEE floating-point value.
- 3.6×10⁻⁴⁹⁵¹ is approximately equal to the smallest non-zero value that can be represented by an 80-bit x86 double-extended IEEE floating-point value.
- 1×10⁻³⁹⁸ is equal to the smallest non-zero value that can be represented by a double-precision IEEE decimal floating-point value.
- 4.9×10⁻³²⁴ is approximately equal to the smallest non-zero value that can be represented by a double-precision IEEE floating-point value.
- 1.5×10⁻¹⁵⁷ is approximately equal to the probability that in a randomly selected group of 365 people, all of them will have different birthdays.^[4]
- 1×10⁻¹⁰¹ is equal to the smallest non-zero value that can be represented by a single-precision IEEE decimal floating-point value.

10⁻¹⁰⁰ to 10⁻³⁰

Mathematics: The chances of shuffling a standard 52-card deck in any specific order is around 1.24×10⁻⁶⁸ (or exactly 1⁄52!)^[5]
Computing: The number 1.4×10⁻⁴⁵ is approximately equal to the smallest positive non-zero value that can be represented by a single-precision IEEE floating-point value.

10⁻³⁰

(0.000000000000000000000000000001; 1000⁻¹⁰; short scale: one nonillionth; long scale: one quintillionth)

ISO: quecto- (q)

Mathematics: The probability in a game of bridge of all four players getting a complete suit each is approximately 4.47×10⁻²⁸.^[6]

10⁻²⁷

(0.000000000000000000000000001; 1000⁻⁹; short scale: one octillionth; long scale: one quadrilliardth)

ISO: ronto- (r)

10⁻²⁴

(0.000000000000000000000001; 1000⁻⁸; short scale: one septillionth; long scale: one quadrillionth)

ISO: yocto- (y)

10⁻²¹

(0.000000000000000000001; 1000⁻⁷; short scale: one sextillionth; long scale: one trilliardth)

ISO: zepto- (z)

Mathematics: The probability of matching 20 numbers for 20 in a game of keno is approximately 2.83 × 10⁻¹⁹.
Mathematics: The odds of a perfect bracket in the NCAA Division I men's basketball tournament are 1 in 2⁶³, approximately 1.08 × 10⁻¹⁹, if coin flips are used to predict the winners of the 63 matches.^[7]

10⁻¹⁸

(0.000000000000000001; 1000⁻⁶; short scale: one quintillionth; long scale: one trillionth)

ISO: atto- (a)

Mathematics: The probability of rolling snake eyes 10 times in a row on a pair of fair dice is about 2.74×10⁻¹⁶.

10⁻¹⁵

(0.000000000000001; 1000⁻⁵; short scale: one quadrillionth; long scale: one billiardth)

ISO: femto- (f)

Mathematics: The Ramanujan constant, $e^{\pi {\sqrt {163}}}=262\,537\,412\,640\,768\,743.999\,999\,999\,999\,25\ldots ,$ is an almost integer, differing from the nearest integer by approximately 7.5×10⁻¹³.

10⁻¹²

(0.000000000001; 1000⁻⁴; short scale: one trillionth; long scale: one billionth)

ISO: pico- (p)

Mathematics: The probability in a game of bridge of one player getting a complete suit is approximately 2.52×10⁻¹¹ (0.00000000252%).
Biology: Human visual sensitivity to 1000 nm light is approximately 1.0×10⁻¹⁰ of its peak sensitivity at 555 nm.^[8]

10⁻⁹

(0.000000001; 1000⁻³; short scale: one billionth; long scale: one milliardth)

ISO: nano- (n)

Mathematics – Lottery: The odds of winning the Grand Prize (matching all 6 numbers) in the US Powerball lottery, with a single ticket, under the rules as of October 2015^[update], are 292,201,338 to 1 against, for a probability of 3.422×10⁻⁹ (0.0000003422%).
Mathematics – Lottery: The odds of winning the Grand Prize (matching all 6 numbers) in the Australian Powerball lottery, with a single ticket, under the rules as of April 2018^[update], are 134,490,400 to 1 against, for a probability of 7.435×10⁻⁹ (0.0000007435%).
Mathematics – Lottery: The odds of winning the Jackpot (matching the 6 main numbers) in the current 59-ball UK National Lottery Lotto, with a single ticket, under the rules as of December 2024^[update], are 45,057,474 to 1 against, for a probability of 2.219×10⁻⁸ (0.000002219%).^[9]
Computing: The number 6×10⁻⁸ is approximately equal to the smallest positive non-zero value that can be represented by a half-precision IEEE floating-point value.
Mathematics – Lottery: The odds of winning the Jackpot (matching the 6 main numbers) in the former 49-ball UK National Lottery, with a single ticket, were 13,983,815 to 1 against, for a probability of 7.151×10⁻⁸ (0.000007151%).

10⁻⁶

(0.000001; 1000⁻²; long and short scales: one millionth)

ISO: micro- (μ)

Poker hands
Hand	Chance
1. Royal flush	0.00015%
2. Straight flush	0.0014%
3. Four of a kind	0.024%
4. Full house	0.14%
5. Flush	0.19%
6. Straight	0.59%
7. Three of a kind	2.1%
8. Two pairs	4.8%
9. One pair	42%
10. No pair	50%

Mathematics – Poker: The odds of being dealt a royal flush in poker are 649,739 to 1 against, for a probability of 1.5×10⁻⁶ (0.00015%).^[10]
Mathematics – Poker: The odds of being dealt a straight flush (other than a royal flush) in poker are 72,192 to 1 against, for a probability of 1.4×10⁻⁵ (0.0014%).
Mathematics – Poker: The odds of being dealt a four of a kind in poker are 4,164 to 1 against, for a probability of 2.4×10⁻⁴ (0.024%).

10⁻³

(0.001; 1000⁻¹; one thousandth)

ISO: milli- (m)

Mathematics – Poker: The odds of being dealt a full house in poker are 693 to 1 against, for a probability of 1.4 × 10⁻³ (0.14%).
Mathematics – Poker: The odds of being dealt a flush in poker are 507.8 to 1 against, for a probability of 1.9 × 10⁻³ (0.19%).
Mathematics – Poker: The odds of being dealt a straight in poker are 253.8 to 1 against, for a probability of 4 × 10⁻³ (0.39%).
Physics: α = 0.007297352570(5), the fine-structure constant.

10⁻²

(0.01; one hundredth)

ISO: centi- (c)

Mathematics – Lottery: The odds of winning any prize in the UK National Lottery, with a single ticket, under the rules as of 2003, are 54 to 1 against, for a probability of about 0.018 (1.8%).
Mathematics – Poker: The odds of being dealt a three of a kind in poker are 46 to 1 against, for a probability of 0.021 (2.1%).
Mathematics – Lottery: The odds of winning any prize in the Powerball, with a single ticket, under the rules as of 2015, are 24.87 to 1 against, for a probability of 0.0402 (4.02%).
Mathematics – Poker: The odds of being dealt two pair in poker are 21 to 1 against, for a probability of 0.048 (4.8%).

10⁻¹

(0.1; one tenth)

ISO: deci- (d)

Legal history: 10% was widespread as the tax raised for income or produce in the ancient and medieval period; see tithe.
Mathematics – Poker: The odds of being dealt only one pair in poker are about 5 to 2 against (2.37 to 1), for a probability of 0.42 (42%).
Mathematics – Poker: The odds of being dealt no pair in poker are nearly 1 to 2, for a probability of about 0.5 (50%).

10⁰

(1; one)

Demography: The population of Monowi, an incorporated village in Nebraska, United States, was one in 2010.
Religion: One is the number of gods in Judaism, Christianity, and Islam (monotheistic religions).
Computing – Unicode: One character is assigned to the Lisu Supplement Unicode block, the fewest of any public-use Unicode block as of Unicode 15.0 (2022).
Mathematics: 1 is the only natural number (not including 0) that is not prime or composite.
Mathematics: ³√2 ≈ 1.259921049894873165, the length of a side of a cube with a volume of 2.
Mathematics: If the Riemann hypothesis is true, Mills' constant is approximately 1.3063778838630806904686144926... (sequence A051021 in the OEIS).
Mathematics: √2 ≈ 1.414213562373095049, the ratio of the diagonal of a square to its side length.
Mathematics: φ ≈ 1.618033988749894848, the golden ratio.
Mathematics: √3 ≈ 1.732050807568877293, the ratio of the diagonal of a unit cube.
Mathematics: the number system understood by most computers, the binary system, uses 2 digits: 0 and 1.
Mathematics: √5 ≈ 2.236 067 9775, the correspondent to the diagonal of a rectangle whose side lengths are 1 and 2.
Mathematics: √2 + 1 ≈ 2.414213562373095049, the silver ratio; the ratio of the smaller of the two quantities to the larger quantity is the same as the ratio of the larger quantity to the sum of the smaller quantity and twice the larger quantity.
Mathematics: e ≈ 2.718281828459045087, the base of the natural logarithm.
Mathematics: the number system understood by ternary computers, the ternary system, uses 3 digits: 0, 1, and 2.
Religion: three manifestations of God in the Christian Trinity.
Mathematics: π ≈ 3.141592653589793238, the ratio of a circle's circumference to its diameter.
Religion: the Four Noble Truths in Buddhism.
Human scale: There are five digits on a human hand, and five toes on a human foot.
Mathematics: 6 is the smallest perfect number.^[11]
Biology: 7 ± 2, in cognitive science, George A. Miller's estimate of the number of objects that can be simultaneously held in human working memory.
Music: 7 notes in a major or minor scale.
Astronomy: 8 planets in the Solar System: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Biology – Spider anatomy: Eight jointed legs of a spider.
Religion: the Noble Eightfold Path in Buddhism.
Literature: 9 circles of Hell in the Inferno by Dante Alighieri.

10¹

(10; ten)

ISO: deca- (da)

Demography: The population of Pesnopoy, a village in Bulgaria, was 10 in 2007.
Human scale: There are 10 digits on a pair of human hands, and 10 toes on a pair of human feet.
Mathematics: The decimal system has 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Religion: the Ten Commandments in the Abrahamic religions.
Mathematics: 11 is the first prime exponent that does not yield a Mersenne prime.
Music: There are 12 notes in the chromatic scale.
Astrology: There are 12 zodiac signs, each one representing part of the annual path of the sun's movement across the night sky.
Computing – Microsoft Windows: Twelve successive consumer versions of Windows NT have been released as of December 2021.
Culture: 13 is considered an "unlucky" number in Western superstition.
Music: Composers Ludwig van Beethoven and Dmitri Shostakovich both completed and numbered 15 string quartets in their lifetimes.
Linguistics: The Finnish language has 15 noun cases.
Mathematics: The hexadecimal system, a common number system used in computer programming, uses 16 digits where the last 6 are typically represented by letters: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.
Computing – Unicode: The minimum possible size of a Unicode block is 16 contiguous code points (i.e., U+abcde0 - U+abcdeF).
Computing – UTF-16/Unicode: There are 17 addressable planes in UTF-16, and, thus, as Unicode is limited to the UTF-16 code space, 17 valid planes in Unicode.
Science fiction: The 23 enigma plays a prominent role in the plot of The Illuminatus! Trilogy by Robert Shea and Robert Anton Wilson.
Mathematics: e^π ≈ 23.140692633
Music: There is a combined total of 24 major and minor keys, also the number of works in some musical cycles of J. S. Bach, Frédéric Chopin, Alexander Scriabin, and Dmitri Shostakovich.
Alphabetic writing: There are 26 letters in the Latin-derived English alphabet (excluding letters found only in foreign loanwords).
History: 39 is considered unlucky in Afghanistan, due to the belief that it is associated with pimps. See Curse of 39.^[12]
Science fiction: The number 42, in the novel The Hitchhiker's Guide to the Galaxy by Douglas Adams, is the Answer to the Ultimate Question of Life, the Universe, and Everything which is calculated by an enormous supercomputer over a period of 7.5 million years.
Biology: A human cell typically contains 46 chromosomes.
Phonology: There are 47 phonemes in English phonology in Received Pronunciation.
Syllabic writing: There are 49 letters in each of the two kana syllabaries (hiragana and katakana) used to represent Japanese (not counting letters representing sound patterns that have never occurred in Japanese).
Chess: Either player in a chess game can claim a draw if 50 consecutive moves are made by each side without any captures or pawn moves.
Culture: 69 is a slang term for reciprocal oral sex.
Mathematics: 70 is the smallest weird number.
Demography: The population of Nassau Island, part of the Cook Islands, was around 78 in 2016.^[13]
Syllabic writing: There are 85 letters in the modern version of the Cherokee syllabary.
Music: Typically, there are 88 keys on a grand piano.
Computing – ASCII: There are 95 printable characters in the ASCII character set.

10²

(100; hundred)

ISO: hecto- (h)

European history: Groupings of 100 homesteads were a common administrative unit in Northern Europe and Great Britain (see Hundred (county division)).
Music: There are 104 numbered symphonies of Franz Josef Haydn.
Religion: 108 is a sacred number in Hinduism.
Chemistry: 118 chemical elements have been discovered or synthesized as of 2016.
Computing – Computational limit of an 8-bit CPU: 127 is equal to 2⁷−1, and as such is the largest number which can fit into a signed (two's complement) 8-bit integer on a computer.
Computing – ASCII: There are 128 characters in the ASCII character set, including nonprintable control characters.
Videogames: There are 151 Pokémon in the first generation.
Phonology: The Taa language is estimated to have between 130 and 164 distinct phonemes.
Political science: There were 193 member states of the United Nations as of 2011.
Computing: A GIF image (or an 8-bit image) supports maximum 256 (2⁸) colors.
Mathematics: 257 is the fourth Fermat prime.
Computing – Unicode: There are 327 different Unicode blocks as of Unicode 15.0 (2022).
Mathematics: 383 is the third Woodall prime.
Computing – HTTP: 404 is the HTTP status code for Not Found.
Mathematics: 563 is the largest known Wilson prime.
Aviation: 583 people died in the 1977 Tenerife airport disaster, the deadliest accident in the history of civil aviation.
Music: The largest number (626) in the Köchel catalogue of works of Wolfgang Amadeus Mozart.
Religion: 666 is the number of the beast from the Book of Revelation.
Demography: Vatican City, the least populous independent country, has an approximate population of 800 as of 2018.

10³

(1000; thousand)

ISO: kilo- (k)

Videogames: There are 1,025 Pokémon up to the ninth and latest generation.
Demography: The population of Ascension Island is 1,122.
Music: 1,128: number of known extant works by Johann Sebastian Bach recognized in the Bach-Werke-Verzeichnis as of 2017.
Mathematics: 1,729 is the first nontrivial taxicab number, expressed as the sum of two cubic numbers in two different ways. It is known as the Ramanujan number or Hardy–Ramanujan number after G. H. Hardy and Srinivasa Ramanujan.
Typesetting: 2,000–3,000 letters on a typical typed page of text.
Mathematics: 2¹¹ − 1 = 2,047 = 23 × 89 is the smallest composite Mersenne number with prime exponent n.
Mathematics: 2,520 (5×7×8×9 or 2³×3²×5×7) is the least common multiple of every positive integer under (and including) 10.
Demographics – Wealth: There are 2,781 billionaires worldwide as of April 2024^[update].^[14]
Terrorism: 2,996 persons (including 19 terrorists) died in the terrorist attacks of September 11, 2001.
Biology: the DNA of the simplest viruses has 3,000 base pairs.^[15]
Mathematics: 3,511 is the largest known Wieferich prime.
Military history: 4,200 (Republic) or 5,200 (Empire) was the standard size of a Roman legion.
Linguistics: Estimates for the linguistic diversity of living human languages or dialects range between 5,000 and 10,000. (SIL Ethnologue in 2009 listed 6,909 known living languages.)
Astronomy – Catalogues: There are 7,840 deep-sky objects in the NGC Catalogue from 1888.
Lexicography: 8,674 unique words in the Hebrew Bible.

10⁴

(10000; ten thousand or a myriad)

Biology: Each neuron in the human brain is estimated to connect to 10,000 others.
Demography: The population of Tuvalu was 10,645 in 2017.
Lexicography: 14,500 unique English words occur in the King James Version of the Bible.
Mathematics: 15,511 is the third Motzkin prime.
Zoology: There are approximately 17,500 distinct butterfly species known.^[16]
Language: There are 20,000–40,000 distinct Chinese characters in more than occasional use.
Biology: Each human being is estimated to have 20,000 coding genes.^[17]
Grammar: Each regular verb in Cherokee can have 21,262 inflected forms.
War: 22,717 Union and Confederate soldiers were killed, wounded, or missing in the Battle of Antietam, the bloodiest single day of battle in American history.
Computing – Computational limit of a 16-bit CPU: 32,767 is equal to 2¹⁵−1, and as such is the largest number which can fit into a signed (two's complement) 16-bit integer on a computer.
Computing – Unicode: 42,720 characters are encoded in CJK Unified Ideographs Extension B, the most of any single public-use Unicode block as of Unicode 15.0 (2022).
Aviation: As of July 2021^[update], 44,000+ airframes have been built of the Cessna 172, the most-produced aircraft in history.
Computing: 65,504 is equal to the largest value that can be represented in the IEEE half precision floating-point format.
Computing - Fonts: The maximum possible number of glyphs in a TrueType or OpenType font is 65,535 (2¹⁶-1), the largest number representable by the 16-bit unsigned integer used to record the total number of glyphs in the font.
Computing – Unicode: A plane contains 65,536 (2¹⁶) code points; this is also the maximum size of a Unicode block, and the total number of code points available in the obsolete UCS-2 encoding.
Mathematics: 65,537 is the fifth and largest known Fermat prime.
Memory: As of 2015^[update], the largest number of decimal places of π that have been recited from memory is 70,030.^[18]
Mathematics: 82,000 is the only known number greater than 1 that can be written in bases from 2 through 5 using only 0s and 1s.^[19]^[20]
Mathematics: 87,360 is the fourth unitary perfect number.

10⁵

(100000; one hundred thousand or a lakh).

Biology – Strands of hair on a head: The average human head has about 100,000–150,000 strands of hair.
Literature: approximately 100,000 verses (shlokas) in the Mahabharata.
Demography: The population of Saint Vincent and the Grenadines was 109,991 in 2012.
Mathematics: 2¹⁷ − 1 = 131,071 is the sixth Mersenne prime. It is the largest nth Mersenne prime with n digits.^[21]
Mathematics: There are 138,240 possible combinations on the Skewb Diamond.
Computing – Unicode: 149,186 characters (including control characters) encoded in Unicode as of version 15.0 (2022).
Language: 267,000 words in James Joyce's Ulysses.
Computing – Unicode: 293,168 code points assigned to a Unicode block as of Unicode 15.0.
Genocide: 300,000 people killed in the Nanjing Massacre.
Language – English words: The New Oxford Dictionary of English contains about 360,000 definitions for English words.
Mathematics: 380,000 – The approximate number of entries in The On-Line Encyclopedia of Integer Sequences as of January 2025^[update].^[22]
Biology – Plants: There are approximately 390,000 distinct plant species known, of which approximately 20% (or 78,000) are at risk of extinction.^[23]
Biology – Flowers: There are approximately 400,000 distinct flower species on Earth.^[24]
Literature: 564,000 words in War and Peace by Leo Tolstoy.
Literature: 930,000 words in the King James Version of the Bible.
Mathematics: There are 933,120 possible combinations on the Pyraminx.
Computing – Unicode: There are 974,530 publicly-assignable code points (i.e., not surrogates, private-use code points, or noncharacters) in Unicode.

10⁶

(1000000; 1000²; long and short scales: one million)

ISO: mega- (M)

Demography: The population of Riga, Latvia was 1,003,949 in 2004, according to Eurostat.
Computing – UTF-8: There are 1,112,064 (2²⁰ + 2¹⁶ - 2¹¹) valid UTF-8 sequences (excluding overlong sequences and sequences corresponding to code points used for UTF-16 surrogates or code points beyond U+10FFFF).
Computing – UTF-16/Unicode: There are 1,114,112 (2²⁰ + 2¹⁶) distinct values encodable in UTF-16, and, thus (as Unicode is currently limited to the UTF-16 code space), 1,114,112 valid code points in Unicode (1,112,064 scalar values and 2,048 surrogates).
Ludology – Number of games: Approximately 1,181,019 video games have been created as of 2019.^[25]
Biology – Species: The World Resources Institute claims that approximately 1.4 million species have been named, out of an unknown number of total species (estimates range between 2 and 100 million species). Some scientists give 8.8 million species as an exact figure.
Genocide: Approximately 800,000–1,500,000 (1.5 million) Armenians were killed in the Armenian genocide.
Linguistics: The number of possible conjugations for each verb in the Archi language is 1,502,839.^[26]
Info: The freedb database of CD track listings has around 1,750,000 entries as of June 2005^[update].
Computing – UTF-8: 2,164,864 (2²¹ + 2¹⁶ + 2¹¹ + 2⁷) possible one- to four-byte UTF-8 sequences, if the restrictions on overlong sequences, surrogate code points, and code points beyond U+10FFFF are not adhered to. (Note that not all of these correspond to unique code points.)
Mathematics – Playing cards: There are 2,598,960 different 5-card poker hands that can be dealt from a standard 52-card deck.
Mathematics: There are 3,149,280 possible positions for the Skewb.
Mathematics – Rubik's Cube: 3,674,160 is the number of combinations for the Pocket Cube (2×2×2 Rubik's Cube).
Geography/Computing – Geographic places: The NIMA GEOnet Names Server contains approximately 3.88 million named geographic features outside the United States, with 5.34 million names. The USGS Geographic Names Information System claims to have almost 2 million physical and cultural geographic features within the United States.
Computing - Supercomputer hardware: 4,981,760 processor cores in the final configuration of the Tianhe-2 supercomputer.
Genocide: Approximately 5,100,000–6,200,000 Jews were killed in the Holocaust.
Info – Web sites: As of April 18, 2025, the English Wikipedia contains approximately 7 million articles in the English language.

10⁷

(10000000; a crore; long and short scales: ten million)

Demography: The population of Haiti was 10,085,214 in 2010.
Literature: 11,206,310 words in Devta by Mohiuddin Nawab, the longest continuously published story known in the history of literature.
Genocide: An estimated 12 million persons shipped from Africa to the New World in the Atlantic slave trade.
Mathematics: 12,988,816 is the number of domino tilings of an 8×8 checkerboard.
Genocide/Famine: 15 million is an estimated lower bound for the death toll of the 1959–1961 Great Chinese Famine, the deadliest known famine in human history.
War: 15 to 22 million casualties estimated as a result of World War I.
Computing: 16,777,216 different colors can be generated using the hex code system in HTML (note that the trichromatic color vision of the human eye can only distinguish between about an estimated 1,000,000 different colors).^[27]
Computing: 16,777,216 (2²⁴) – number until which all integer values can exactly be represented in IEEE single precision floating-point format.
Mathematics: There are 19,958,400 possible combinations on the Dino Cube.^[28]
Science Fiction: In Isaac Asimov's Galactic Empire, in 22,500 CE, there are 25,000,000 different inhabited planets in the Galactic Empire, all inhabited by humans in Asimov's "human galaxy" scenario.
Demography: The population of Saudi Arabia was 34,566,328 in 2022.
Demography: The population of Canada was 36,991,981 in 2021.
Demographics – Oceania: The population of Oceania was 44,491,724 in 2021.
Genocide/Famine: 55 million is an estimated upper bound for the death toll of the Great Chinese Famine.
Literature: Wikipedia contains a total of around 64 million articles in 355 languages as of April 2025.
Demography: The population of the United Kingdom was 66,940,559 in 2021.
War: 70 to 85 million casualties estimated as a result of World War II.
Mathematics: 73,939,133 is the largest right-truncatable prime.
Mathematics: 87,539,319 is the third taxicab number.

10⁸

(100000000; long and short scales: one hundred million)

Demography: The population of the Philippines was 100,981,437 in 2015.
Internet – YouTube: The number of YouTube channels is estimated to be 113.9 million.^[29]
Info – Books: The British Library holds more than 150 million items. The Library of Congress holds approximately 148 million items. See The Gutenberg Galaxy.
Video gaming: As of 2020^[update], approximately 200 million copies of Minecraft (the most-sold video game in history) have been sold.
Mathematics: More than 215,000,000 mathematical constants are collected on the Plouffe's Inverter as of 2010^[update].^[30]
Mathematics: 275,305,224 is the number of 5×5 normal magic squares, not counting rotations and reflections. This result was found in 1973 by Richard Schroeppel.
Demography: The population of the United States was 331,449,281 in 2020.
Mathematics: 358,833,097 stellations of the rhombic triacontahedron.
Mathematics: There are 406,425,600 possible combinations on the Rubik's Domino.^[31]
Demographics – South America: The population of South America was 434,254,119 in 2021.
Info – Web sites: As of November 2011^[update], the Netcraft web survey estimates that there are 525,998,433 (526 million) distinct websites.
Demographics – North America: The population of North America was 592,296,233 in 2021.
Demographics – Europe: The population of Europe was 745,173,774 in 2021.
Toys – Lego: Six bricks of 2 × 4 Lego studs^[32] can be combined in 915,103,765 ways.^[33]
Astronomy – Cataloged stars: The Guide Star Catalog II has entries on 998,402,801 distinct astronomical objects.

10⁹

(1000000000; 1000³; short scale: one billion; long scale: one thousand million, or one milliard)

ISO: giga- (G)

Info – Web sites: As of April 18, 2025, the English Wikipedia has been edited approximately 1.3 billion times.
Transportation – Cars: As of 2018^[update], there are approximately 1.4 billion cars in the world, corresponding to around 18% of the human population.^[34]
Demographics – China: 1,409,670,000 – approximate population of the People's Republic of China in 2023.^[35]
Demographics – India: 1,428,627,663 – approximate population of India in 2023.^[36]
Demographics – Africa: The population of Africa reached 1,430,000,000 sometime in 2023.
Internet – Google: There are more than 1,500,000,000 active Gmail users globally.^[37]
Internet: Approximately 1,500,000,000 active users were on Facebook as of October 2015.^[38]
Computing – Computational limit of a 32-bit CPU: 2,147,483,647 is equal to 2³¹−1, and as such is the largest number which can fit into a signed (two's complement) 32-bit integer on a computer.
Computing – UTF-8: 2,147,483,648 (2³¹) possible code points (U+0000 - U+7FFFFFFF) in the pre-2003 version of UTF-8 (including five- and six-byte sequences), before the UTF-8 code space was limited to the much smaller set of values encodable in UTF-16.
Biology – base pairs in the genome: approximately 3.3×10⁹ base pairs in the human genome.^[17]
Linguistics: 3,400,000,000 – the total number of speakers of Indo-European languages, of which 2,400,000,000 are native speakers; the other 1,000,000,000 speak Indo-European languages as a second language.
Mathematics and computing: 4,294,967,295 (2³² − 1), the product of the five known Fermat primes and the maximum value for a 32-bit unsigned integer in computing.
Computing – IPv4: 4,294,967,296 (2³²) possible unique IP addresses.
Computing: 4,294,967,296 – the number of bytes in 4 gibibytes; in computation, 32-bit computers can directly access 2³² units (bytes) of address space, which leads directly to the 4-gigabyte limit on main memory.
Mathematics: 4,294,967,297 is a Fermat number and semiprime. It is the smallest number of the form $2^{2^{n}}+1$ which is not a prime number.
Demographics – Asia: The population of Asia was 4,694,576,167 in 2021.
Demographics – world population: 8,019,876,189 – Estimated population for the world as of 1 January 2024.^[39]

10¹⁰

(10000000000; short scale: ten billion; long scale: ten thousand million, or ten milliard)

Biology – bacteria in the human body: There are roughly 10¹⁰ bacteria in the human mouth.^[40]
Mathematics: 32,212,254,719 is the fourth Woodall prime.
Mathematics: 51,001,180,160 is the largest known triperfect number.
Computing – web pages: approximately 5.6×10¹⁰ web pages indexed by Google as of 2010.

10¹¹

(100000000000; short scale: one hundred billion; long scale: hundred thousand million, or hundred milliard)

Astronomy: There are 100 billion planets located in the Milky Way.^[41]^[42]
Astronomy – stars in our galaxy: of the order of 10¹¹ stars in the Milky Way galaxy.^[43]
Biology – Neurons in the brain: approximately (1±0.2) × 10¹¹ neurons in the human brain.^[44]
Paleodemography – Number of humans that have ever lived: approximately (1.2±0.3) × 10¹¹ live births of anatomically modern humans since the beginning of the Upper Paleolithic.^[45]
Mathematics – Nine-Colour Cube: 268,240,896,000 is the number of combinations for the Nine-Colour Cube.^[46]
Medicine: The United States Food and Drug Administration requires a minimum of 3 x 10¹¹ (300 billion) platelets per apheresis unit.^[47]
Mathematics: 608,981,813,029 is the smallest number for which there are more primes of the form 3k + 1 than of the form 3k + 2 up to the number.^[48]

10¹²

(1000000000000; 1000⁴; short scale: one trillion; long scale: one billion)

ISO: tera- (T)

Astronomy: Andromeda Galaxy, which is part of the same Local Group as our galaxy, contains about 10¹² stars.
Biology – Bacteria on the human body: The surface of the human body houses roughly 10¹² bacteria.^[40]
Astronomy – Galaxies: A 2016 estimate says there are 2 × 10¹² galaxies in the observable universe.^[49]
Biology: An estimate says there were 3.04 × 10¹² trees on Earth in 2015.^[50]
Mathematics: 6,963,472,309,248 is the fourth taxicab number.
Mathematics: 7,625,597,484,987 – a number that often appears when dealing with powers of 3. It can be expressed as $19683^{3}$ , $27^{9}$ , $3^{27}$ , $3^{3^{3}}$ and ³3 or when using Knuth's up-arrow notation it can be expressed as $3\uparrow \uparrow 3$ and $3\uparrow \uparrow \uparrow 2$ .
Astronomy: A light-year, as defined by the International Astronomical Union (IAU), is the distance that light travels in a vacuum in one year, which is equivalent to about 9.46 trillion kilometers (9.46×10¹² km).
Mathematics: 10¹³ – The approximate number of known non-trivial zeros of the Riemann zeta function as of 2004^[update].^[51]
Biology – Blood cells in the human body: The average human body is estimated to have (2.5 ± .5) × 10¹³ red blood cells.^[52]^[53]
Mathematics – Known digits of π: As of March 2019^[update], the number of known digits of π is 31,415,926,535,897 (the integer part of π×10¹³).^[54]
Mathematics – Digits of $e$ : As of December 2023^[update], the number $e$ has been calculated to 35,000,000,000,000 digits.^[55]
Biology – approximately 10¹⁴ synapses in the human brain.^[56]
Biology – Cells in the human body: The human body consists of roughly 10¹⁴ cells, of which only 10¹³ are human.^[57]^[58] The remaining 90% non-human cells (though much smaller and constituting much less mass) are bacteria, which mostly reside in the gastrointestinal tract, although the skin is also covered in bacteria.
Mathematics: The first case of exactly 18 prime numbers between multiples of 100 is 122,853,771,370,900 + n,^[59] for n = 1, 3, 7, 19, 21, 27, 31, 33, 37, 49, 51, 61, 69, 73, 87, 91, 97, 99.
Cryptography: 150,738,274,937,250 configurations of the plug-board of the Enigma machine used by the Germans in WW2 to encode and decode messages by cipher.
Computing – MAC-48: 281,474,976,710,656 (2⁴⁸) possible unique physical addresses.
Mathematics: 953,467,954,114,363 is the fourth and largest known Motzkin prime.

10¹⁵

(1000000000000000; 1000⁵; short scale: one quadrillion; long scale: one thousand billion, or one billiard)

ISO: peta- (P)

Biology – Insects: 1,000,000,000,000,000 to 10,000,000,000,000,000 (10¹⁵ to 10¹⁶) – The estimated total number of ants on Earth alive at any one time (their biomass is approximately equal to the total biomass of the human species).^[60]
Computing: 9,007,199,254,740,992 (2⁵³) – number until which all integer values can exactly be represented in IEEE double precision floating-point format.
Mathematics: 48,988,659,276,962,496 is the fifth taxicab number.
Science Fiction: In Isaac Asimov's Galactic Empire, in what we call 22,500 CE, there are 25,000,000 different inhabited planets in the Galactic Empire, all inhabited by humans in Asimov's "human galaxy" scenario, each with an average population of 2,000,000,000, thus yielding a total Galactic Empire population of approximately 50,000,000,000,000,000.
Cryptography: There are 2⁵⁶ = 72,057,594,037,927,936 different possible keys in the obsolete 56-bit DES symmetric cipher.
Science Fiction: There are approximately 100,000,000,000,000,000 (10¹⁷) sentient beings in the Star Wars galaxy.
Mathematics – Ramanujan's constant: $e π \sqrt 163$ = 262537412640768743.99999999999925007259... (sequence A060295 in the OEIS). This number is very close to the integer $6403203 + 744$ . See 10⁻¹⁵.
Physical culture: Highest amount of bytes lifted by a human is 318,206,335,271,488,635 by Hafþór Júlíus Björnsson.^[61]

10¹⁸

(1000000000000000000; 1000⁶; short scale: one quintillion; long scale: one trillion)

ISO: exa- (E)

Mathematics: The first case of exactly 19 prime numbers between multiples of 100 is 1,468,867,005,116,420,800 + n,^[59] for n = 1, 3, 7, 9, 21, 31, 37, 39, 43, 49, 51, 63, 67, 69, 73, 79, 81, 87, 93.
Mathematics: 2⁶¹ − 1 = 2,305,843,009,213,693,951 (≈2.31×10¹⁸) is the ninth Mersenne prime. It was determined to be prime in 1883 by Ivan Mikheevich Pervushin. This number is sometimes called Pervushin's number.
Mathematics: Goldbach's conjecture has been verified for all n ≤ 4×10¹⁸ by a project which computed all prime numbers up to that limit.^[62]
Computing – Manufacturing: An estimated 6×10¹⁸ transistors were produced worldwide in 2008.^[63]
Computing – Computational limit of a 64-bit CPU: 9,223,372,036,854,775,807 (about 9.22×10¹⁸) is equal to 2⁶³−1, and as such is the largest number which can fit into a signed (two's complement) 64-bit integer on a computer.
Mathematics – NCAA basketball tournament: There are 9,223,372,036,854,775,808 (2⁶³) possible ways to enter the bracket.
Mathematics – Bases: 9,439,829,801,208,141,318 (≈9.44×10¹⁸) is the 10th and (by conjecture) largest number with more than one digit that can be written from base 2 to base 18 using only the digits 0 to 9, meaning the digits for 10 to 17 are not needed in bases greater than 10.^[64]
Biology – Insects: It has been estimated that the insect population of the Earth is about 10¹⁹.^[65]
Mathematics – Answer to the wheat and chessboard problem: When doubling the grains of wheat on each successive square of a chessboard, beginning with one grain of wheat on the first square, the final number of grains of wheat on all 64 squares of the chessboard when added up is 2⁶⁴−1 = 18,446,744,073,709,551,615 (≈1.84×10¹⁹).
Mathematics – Legends: The Tower of Brahma legend tells about a Hindu temple containing a large room with three posts, on one of which are 64 golden discs, and the object of the mathematical game is for the Brahmins in this temple to move all of the discs to another pole so that they are in the same order, never placing a larger disc above a smaller disc, moving only one at a time. Using the simplest algorithm for moving the disks, it would take 2⁶⁴−1 = 18,446,744,073,709,551,615 (≈1.84×10¹⁹) turns to complete the task (the same number as the wheat and chessboard problem above).^[66]
Computing – IPv6: 18,446,744,073,709,551,616 (2⁶⁴; ≈1.84×10¹⁹) possible unique /64 subnetworks.
Mathematics – Rubik's Cube: There are 43,252,003,274,489,856,000 (≈4.33×10¹⁹) different positions of a 3×3×3 Rubik's Cube.
Password strength: Usage of the 95-character set found on standard computer keyboards for a 10-character password yields a computationally intractable 59,873,693,923,837,890,625 (95¹⁰, approximately 5.99×10¹⁹) permutations.
Internet – YouTube: There are 73,786,976,294,838,206,464 (2⁶⁶; ≈7.38×10¹⁹) possible YouTube video URLs.^[67]
Economics: Hyperinflation in Zimbabwe estimated in February 2009 by some economists at 10 sextillion percent,^[68] or a factor of 10²⁰.
Mathematics: 2⁶⁸ = 295,147,905,179,352,825,856 is the first power of two to contain all decimal digits.^[69]

10²¹

(1000000000000000000000; 1000⁷; short scale: one sextillion; long scale: one thousand trillion, or one trilliard)

ISO: zetta- (Z)

Geo – Grains of sand: All the world's beaches combined have been estimated to hold roughly 10²¹ grains of sand.^[70]
Computing – Manufacturing: Intel predicted that there would be 1.2×10²¹ transistors in the world by 2015^[71] and Forbes estimated that 2.9×10²¹ transistors had been shipped up to 2014.^[72]
Mathematics – Sudoku: There are 6,670,903,752,021,072,936,960 (≈6.7×10²¹) 9×9 sudoku grids.^[73]
Mathematics: The first case of exactly 20 prime numbers between multiples of 100 is 20,386,095,164,137,273,086,400 + n,^[59] for n = 1, 3, 7, 9, 13, 19, 21, 31, 33, 37, 49, 57, 63, 73, 79, 87, 91, 93, 97, 99.
Mathematics: 5³² = 23,283,064,365,386,962,890,625 is the largest known power of five not containing a pair of consecutive equal digits.^[74]
Mathematics: 24,153,319,581,254,312,065,344 is the sixth and largest known taxicab number.
Astronomy – Stars: 70 sextillion = 7×10²², the estimated number of stars within range of telescopes (as of 2003).^[75]
Astronomy – Stars: in the range of 10²³ to 10²⁴ stars in the observable universe.^[76]
Mathematics: 146,361,946,186,458,562,560,000 (≈1.5×10²³) is the fifth and largest known unitary perfect number.
Mathematics: 357,686,312,646,216,567,629,137 (≈3.6×10²³) is the largest left-truncatable prime.

Chemistry – Physics: The Avogadro constant (6.02214076×10²³) is the number of constituents (e.g. atoms or molecules) in one mole of a substance, defined for convenience as expressing the order of magnitude separating the molecular from the macroscopic scale.

10²⁴

(1000000000000000000000000; 1000⁸; short scale: one septillion; long scale: one quadrillion)

ISO: yotta- (Y)

Mathematics: 2,833,419,889,721,787,128,217,599 (≈2.8×10²⁴) is the fifth Woodall prime.
Mathematics: 3,608,528,850,368,400,786,036,725 (≈3.6×10²⁴) is the largest polydivisible number.
Mathematics – Impossiball: There are 23,563,902,142,421,896,679,424,000 (about 2.36×10²⁵) different positions of the Impossiball.
Mathematics: 2⁸⁶ = 77,371,252,455,336,267,181,195,264 is the largest known power of two not containing the digit '0' in its decimal representation.^[77]
Mathematics: 2⁸⁹ − 1 = 618,970,019,642,690,137,449,562,111 (≈6.19×10²⁶) is the tenth Mersenne prime. See List of Mersenne primes and perfect numbers.

10²⁷

(1000000000000000000000000000; 1000⁹; short scale: one octillion; long scale: one thousand quadrillion, or one quadrilliard)

ISO: ronna- (R)

Biology – Atoms in the human body: the average human body contains roughly 7×10²⁷ atoms.^[78]
Mathematics – Poker: the number of unique combinations of hands and shared cards in a 10-player game of Texas hold 'em is approximately 2.117×10²⁸.

10³⁰

(1000000000000000000000000000000; 1000¹⁰; short scale: one nonillion; long scale: one quintillion)

ISO: quetta- (Q)

Mathematics: Belphegor's prime, 10³⁰ + 666 × 10¹⁴ + 1, or 1,000,000,000,000,066,600,000,000,000,001.
Biology – Bacterial cells on Earth: The number of bacterial cells on Earth is estimated at 5,000,000,000,000,000,000,000,000,000,000, or 5 × 10³⁰.^[79]
Mathematics: 5,000,000,000,000,000,000,000,000,000,027 is the largest quasi-minimal prime.
Mathematics: The number of partitions of 1000 is 24,061,467,864,032,622,473,692,149,727,991.^[80]
Mathematics: 3⁶⁸ = 278,128,389,443,693,511,257,285,776,231,761 is the largest known power of three not containing the digit '0' in its decimal representation.^[81]
Mathematics: 2¹⁰⁸ = 324,518,553,658,426,726,783,156,020,576,256 is the largest known power of two not containing the digit '9' in its decimal representation.^[82]

10³³

(1000000000000000000000000000000000; 1000¹¹; short scale: one decillion; long scale: one thousand quintillion, or one quintilliard)

Mathematics – Alexander's Star: There are 72,431,714,252,715,638,411,621,302,272,000,000 (about 7.24×10³⁴) different positions of Alexander's Star.

10³⁶

(1000000000000000000000000000000000000; 1000¹²; short scale: one undecillion; long scale: one sextillion)

Biology: The total number of DNA base pairs on Earth is estimated at 5.0×10³⁷.^[83]
Mathematics: 2¹²⁶ = 85,070,591,730,234,615,865,843,651,857,942,052,864 is the largest known power of two not containing a pair of consecutive equal digits.^[84]
Mathematics: 2^2⁷−1 − 1 = 170,141,183,460,469,231,731,687,303,715,884,105,727 (≈1.7×10³⁸) is the largest known double Mersenne prime and the 12th Mersenne prime.
Computing: 2¹²⁸ = 340,282,366,920,938,463,463,374,607,431,768,211,456 (≈3.40282367×10³⁸), the theoretical maximum number of Internet addresses that can be allocated under the IPv6 addressing system, one more than the largest value that can be represented by a single-precision IEEE floating-point value, the total number of different Universally Unique Identifiers (UUIDs) that can be generated.
Cryptography: 2¹²⁸ = 340,282,366,920,938,463,463,374,607,431,768,211,456 (≈3.40282367×10³⁸), the total number of different possible keys in the AES 128-bit key space (symmetric cipher).

10³⁹

(1000000000000000000000000000000000000000; 1000¹³; short scale: one duodecillion; long scale: one thousand sextillion, or one sextilliard)

Cosmology: The Eddington–Dirac number is roughly 10⁴⁰.
Mathematics: 5⁵⁸ = 34,694,469,519,536,141,888,238,489,627,838,134,765,625 is the largest known power of five not containing the digit '0' in its decimal representation.^[85]
Mathematics: 97# × 2⁵ × 3³ × 5 × 7 = 69,720,375,229,712,477,164,533,808,935,312,303,556,800 (≈6.97×10⁴⁰) is the least common multiple of every integer from 1 to 100.

10⁴² to 10⁶³

(1000000000000000000000000000000000000000000; 1000¹⁴; short scale: one tredecillion; long scale: one septillion)

Mathematics: 141 × 2¹⁴¹ + 1 = 393,050,634,124,102,232,869,567,034,555,427,371,542,904,833 (≈3.93×10⁴⁴) is the second Cullen prime.
Mathematics: There are 7,401,196,841,564,901,869,874,093,974,498,574,336,000,000,000 (≈7.4×10⁴⁵) possible permutations for the Rubik's Revenge (4×4×4 Rubik's Cube).

Chess: 4.52×10⁴⁶ is a proven upper bound for the number of chess positions allowed according to the rules of chess.^[86]
Geo: 1.33×10⁵⁰ is the estimated number of atoms on Earth.
Mathematics: 2¹⁶⁸ = 374,144,419,156,711,147,060,143,317,175,368,453,031,918,731,001,856 is the largest known power of two which is not pandigital: There is no digit '2' in its decimal representation.^[87]
Mathematics: 3¹⁰⁶ = 375,710,212,613,636,260,325,580,163,599,137,907,799,836,383,538,729 is the largest known power of three which is not pandigital: There is no digit '4' in its decimal representation.^[87]
Mathematics: 808,017,424,794,512,875,886,459,904,961,710,757,005,754,368,000,000,000 (≈8.08×10⁵³) is the order of the monster group.
Cryptography: 2¹⁹² = 6,277,101,735,386,680,763,835,789,423,207,666,416,102,355,444,464,034,512,896 (6.27710174×10⁵⁷), the total number of different possible keys in the Advanced Encryption Standard (AES) 192-bit key space (symmetric cipher).
Cosmology: 8×10⁶⁰ is roughly the number of Planck time intervals since the universe is theorised to have been created in the Big Bang 13.799 ± 0.021 billion years ago.^[88]

10⁶³ to 10¹⁰⁰

(1000000000000000000000000000000000000000000000000000000000000000; 1000²¹; short scale: one vigintillion; long scale: one thousand decillion, or one decilliard)

Cosmology: 1×10⁶³ is Archimedes' estimate in The Sand Reckoner of the total number of grains of sand that could fit into the entire cosmos, the diameter of which he estimated in stadia to be what we call 2 light-years.
Mathematics: 3¹³³ = 2,865,014,852,390,475,710,679,572,105,323,242,035,759,805,416,923,029,389,510,561,523 is the largest known power of three not containing a pair of consecutive equal digits.^[89]
Mathematics – Cards: 52! = 80,658,175,170,943,878,571,660,636,856,403,766,975,289,505,440,883,277,824,000,000,000,000 (≈8.07×10⁶⁷) – the number of ways to order the cards in a 52-card deck.
Mathematics: There are ≈1.01×10⁶⁸ possible combinations for the Megaminx.
Mathematics: 1,808,422,353,177,349,564,546,512,035,512,530,001,279,481,259,854,248,860,454,348,989,451,026,887 (≈1.81×10⁷²) – The largest known prime factor found by Lenstra elliptic-curve factorization (LECF) as of 2010^[update].^[90]
Mathematics: There are 282,870,942,277,741,856,536,180,333,107,150,328,293,127,731,985,672,134,721,536,000,000,000,000,000 (≈2.83×10⁷⁴) possible permutations for the Professor's Cube (5×5×5 Rubik's Cube).
Cryptography: 2²⁵⁶ = 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936 (≈1.15792089×10⁷⁷), the total number of different possible keys in the Advanced Encryption Standard (AES) 256-bit key space (symmetric cipher).
Cosmology: Various sources estimate the total number of fundamental particles in the observable universe to be within the range of 10⁸⁰ to 10⁸⁵.^[91]^[92] However, these estimates are generally regarded as guesswork. (Compare the Eddington number, the estimated total number of protons in the observable universe.)
Computing: 9.999 999×10⁹⁶ is equal to the largest value that can be represented in the IEEE decimal32 floating-point format.
Computing: 69! (roughly 1.7112245×10⁹⁸), is the largest factorial value that can be represented on a calculator with two digits for powers of ten without overflow.
Mathematics: One googol, 1×10¹⁰⁰, 1 followed by one hundred zeros, or 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.

10¹⁰⁰ (one googol) to 10¹⁰⁰⁰

(10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000; short scale: ten duotrigintillion; long scale: ten thousand sexdecillion, or ten sexdecillard)^[93]

Mathematics: There are 157 152 858 401 024 063 281 013 959 519 483 771 508 510 790 313 968 742 344 694 684 829 502 629 887 168 573 442 107 637 760 000 000 000 000 000 000 000 000 (≈1.57×10¹¹⁶) distinguishable permutations of the V-Cube 6 (6×6×6 Rubik's Cube).
Chess: Shannon number, 10¹²⁰, a lower bound of the game-tree complexity of chess.
Physics: 10¹²⁰, discrepancy between the observed value of the cosmological constant and a naive estimate based on Quantum Field Theory and the Planck energy.
Physics: 8×10¹²⁰, ratio of the mass-energy in the observable universe to the energy of a photon with a wavelength the size of the observable universe.
Mathematics: 19 568 584 333 460 072 587 245 340 037 736 278 982 017 213 829 337 604 336 734 362 294 738 647 777 395 483 196 097 971 852 999 259 921 329 236 506 842 360 439 300 (≈1.96×10¹²¹) is the period of Fermat pseudoprimes.
History – Religion: Asaṃkhyeya is a Buddhist name for the number 10¹⁴⁰. It is listed in the Avatamsaka Sutra and metaphorically means "innumerable" in the Sanskrit language of ancient India.
Xiangqi: 10¹⁵⁰, an estimation of the game-tree complexity of xiangqi.
Mathematics: 2⁵²¹ − 1 = 6 864 797 660 130 609 714 981 900 799 081 393 217 269 435 300 143 305 409 394 463 459 185 543 183 397 656 052 122 559 640 661 454 554 977 296 311 391 480 858 037 121 987 999 716 643 812 574 028 291 115 057 151 (≈6.86×10¹⁵⁶) is the largest known prime which is simultaneously a Mersenne prime and Woodall prime.^[94]
Mathematics: There are 19 500 551 183 731 307 835 329 126 754 019 748 794 904 992 692 043 434 567 152 132 912 323 232 706 135 469 180 065 278 712 755 853 360 682 328 551 719 137 311 299 993 600 000 000 000 000 000 000 000 000 000 000 000 (≈1.95×10¹⁶⁰) distinguishable permutations of the V-Cube 7 (7×7×7 Rubik's Cube).

Go: There are 208 168 199 381 979 984 699 478 633 344 862 770 286 522 453 884 530 548 425 639 456 820 927 419 612 738 015 378 525 648 451 698 519 643 907 259 916 015 628 128 546 089 888 314 427 129 715 319 317 557 736 620 397 247 064 840 935 (≈2.08×10¹⁷⁰) legal positions in the game of Go. See Go and mathematics.
Economics: The annualized rate of the hyperinflation in Hungary in 1946 was estimated to be 2.9×10¹⁷⁷%.^[95] It was the most extreme case of hyperinflation ever recorded.
Board games: 3.457×10¹⁸¹, number of ways to arrange the tiles in English Scrabble on a standard 15-by-15 Scrabble board.
Physics: 10¹⁸⁶, approximate number of Planck volumes in the observable universe.
Mathematics: There are 1 232 507 756 161 568 013 733 174 639 895 750 813 761 087 074 840 896 182 396 140 424 396 146 760 158 229 902 239 889 099 665 575 990 049 299 860 175 851 176 152 712 039 950 335 697 389 221 704 074 672 278 055 758 253 470 515 200 000 000 000 000 000 000 000 000 000 000 000 (≈1.23×10²⁰⁴) distinguishable permutations of the Tuttminx.
Mathematics: There are 35 173 780 923 109 452 777 509 592 367 006 557 398 539 936 328 978 098 352 427 605 879 843 998 663 990 903 628 634 874 024 098 344 287 402 504 043 608 416 113 016 679 717 941 937 308 041 012 307 368 528 117 622 006 727 311 360 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 (≈3.52×10²¹⁷) distinguishable permutations of the V-Cube 8 (8×8×8 Rubik's Cube).
Shogi: 10²²⁶, an estimation of the game-tree complexity of shogi.
Physics: 7×10²⁴⁵, approximate spacetime volume of the history of the observable universe in Planck units.^[96]
Computing: 1.797 693 134 862 315 807×10³⁰⁸ is approximately equal to the largest value that can be represented in the IEEE double precision floating-point format.
Computing: (10 – 10⁻¹⁵)×10³⁸⁴ is equal to the largest value that can be represented in the IEEE decimal64 floating-point format.
Mathematics: 997# × 31# × 7 × 5² × 3⁴ × 2⁷ = 7 128 865 274 665 093 053 166 384 155 714 272 920 668 358 861 885 893 040 452 001 991 154 324 087 581 111 499 476 444 151 913 871 586 911 717 817 019 575 256 512 980 264 067 621 009 251 465 871 004 305 131 072 686 268 143 200 196 609 974 862 745 937 188 343 705 015 434 452 523 739 745 298 963 145 674 982 128 236 956 232 823 794 011 068 809 262 317 708 861 979 540 791 247 754 558 049 326 475 737 829 923 352 751 796 735 248 042 463 638 051 137 034 331 214 781 746 850 878 453 485 678 021 888 075 373 249 921 995 672 056 932 029 099 390 891 687 487 672 697 950 931 603 520 000 (≈7.13×10⁴³²) is the least common multiple of every integer from 1 to 1000.

10¹⁰⁰⁰ to 10^1,000,000

Mathematics: 4713 × 2⁴⁷¹³ + 1 ≈ 2.68×10¹⁴²² is the third Cullen prime.
Mathematics: There are approximately 1.869×10⁴⁰⁹⁹ distinguishable permutations of the world's largest Rubik's Cube (33×33×33).
Computing: 1.189 731 495 357 231 765 05×10⁴⁹³² is approximately equal to the largest value that can be represented in the IEEE 80-bit x86 extended precision floating-point format.
Computing: 1.189 731 495 357 231 765 085 759 326 628 007 0×10⁴⁹³² is approximately equal to the largest value that can be represented in the IEEE quadruple-precision floating-point format.
Computing: (10 – 10⁻³³)×10⁶¹⁴⁴ is equal to the largest value that can be represented in the IEEE decimal128 floating-point format.
Computing: 10^10,000 − 1 is equal to the largest value that can be represented in Windows Phone's calculator.
Mathematics: F₂₀₁₁₀₇ is a 42,029-digit Fibonacci prime; the largest known certain Fibonacci prime as of September 2023^[update].^[97]
Mathematics: L₂₀₂₆₆₇ is a 42,355-digit Lucas prime; the largest confirmed Lucas prime as of November 2023^[update].^[98]
Mathematics: 104,824⁵ + 5^104,824 is the largest proven Leyland prime; with 73,269 digits as of April 2023^[update].^[99]
Mathematics: approximately 7.76 × 10^206,544 cattle in the smallest herd which satisfies the conditions of Archimedes's cattle problem.
Mathematics: 2,618,163,402,417 × 2^1,290,000 − 1 is a 388,342-digit Sophie Germain prime; the largest known as of April 2023^[update].^[100]
Mathematics: 2,996,863,034,895 × 2^1,290,000 ± 1 are 388,342-digit twin primes; the largest known as of April 2023^[update].^[101]

10^1,000,000 to 10^10¹⁰⁰ (one googolplex)

Mathematics: L_5466311 is a 1,142,392-digit Lucas probable prime; the largest known as of August 2022^[update].^[102]
Mathematics: 3,267,113# – 1 is a 1,418,398-digit primorial prime; the largest known as of April 2023^[update].^[103]
Mathematics – Literature: Jorge Luis Borges' Library of Babel contains at least 25^1,312,000 ≈ 1.956 × 10^1,834,097 books (this is a lower bound).^[104]
Mathematics: 10^1,888,529 − 10^944,264 – 1 is a 1,888,529-digit palindromic prime, the largest known as of April 2023^[update].^[105]
Mathematics: 4 × 72^1,119,849 − 1 is the smallest prime of the form 4 × 72ⁿ − 1.^[106]
Mathematics: 2^6,972,593 − 1 is a 2,098,960-digit Mersenne prime; the 38th Mersenne prime and the last Mersenne prime discovered in the 20th century.^[107]
Mathematics: F_10367321 is a 2,166,642-digit probable Fibonacci prime; the largest known as of July 2024^[update].^[108]
Mathematics: 422,429! + 1 is a 2,193,027-digit factorial prime; the largest known as of April 2023^[update].^[109]
Mathematics: (2^15,135,397 + 1)/3 is a 4,556,209-digit Wagstaff probable prime, the largest known as of June 2021^[update].
Mathematics: 81 × 2^20,498,148 + 1 is a 6,170,560-digit Pierpont prime, the largest known as of 2023^[update].^[110]
Mathematics: 1,963,736^1,048,576 + 1 is a 6,598,776-digit Generalized Fermat prime, the largest known as of April 2023^[update].^[111]
Mathematics: (10^8,177,207 − 1)/9 is a 8,177,207-digit probable prime, the largest known as of 8 May 2021^[update].^[112]
Mathematics: 10,223 × 2^31,172,165 + 1 is a 9,383,761-digit Proth prime, the largest known Proth prime^[113] and non-Mersenne prime as of 2021^[update].^[114]

Mathematics: 2^82,589,933 − 1 is a 24,862,048-digit Mersenne prime; the second largest known prime of any kind as of 2025^[update].^[114]
Mathematics: 2^136,279,841 − 1 is a 41,024,320-digit Mersenne prime; the largest known prime of any kind as of 2025^[update].^[114]
Mathematics: 2^82,589,932 × (2^82,589,933 − 1) is a 49,724,095-digit perfect number, the second largest known as of 2025.^[107]
Mathematics: 2^136,279,840 × (2^136,279,841 − 1) is an 82,048,640-digit perfect number, the largest known as of 2025.^[107]
Mathematics – History: 10^8×10¹⁶, largest named number in Archimedes' Sand Reckoner.
Mathematics: SSCG(2) = 3 × 2^{(3 × 2⁹⁵)} − 8 ≈ 3.241704 × 10^{35775080127201286522908640065}. Its first and last 20 digits are 32417042291246009846...34057047399148290040. See Friedman's SSCG function.
Mathematics: 10^googol ( $10^{10^{100}}$ ), a googolplex. A number 1 followed by 1 googol zeros. Carl Sagan has estimated that 1 googolplex, fully written out, would not fit in the observable universe because of its size.^[115]

Larger than 10^10¹⁰⁰

(One googolplex; 10^googol; short scale: googolplex; long scale: googolplex)

Go: There are at least 10^10¹⁰⁸ legal games of Go. See Game Tree Complexity.
Mathematics – Literature: The number of different ways in which the books in Jorge Luis Borges' Library of Babel can be arranged is approximately $10^{10^{1,834,102}}$ , the factorial of the number of books in the Library of Babel.
Cosmology: In chaotic inflation theory, proposed by physicist Andrei Linde, our universe is one of many other universes with different physical constants that originated as part of our local section of the multiverse, owing to a vacuum that had not decayed to its ground state. According to Linde and Vanchurin, the total number of these universes is about $10^{10^{10,000,000}}$ .^[116]
Mathematics: $10^{\,\!10^{10^{34}}}$ , order of magnitude of an upper bound that occurred in a proof of Skewes (this was later estimated to be closer to 1.397 × 10³¹⁶).
Cosmology: The estimated number of Planck time units for quantum fluctuations and tunnelling to generate a new Big Bang is estimated to be $10^{10^{10^{56}}}$ .
Mathematics: $10^{\,\!10^{10^{100}}}$ , a number in the googol family called a googolplexplex, googolplexian, or googolduplex. 1 followed by a googolplex zeros, or 10^googolplex
Cosmology: The uppermost estimate to the size of the entire universe is approximately $10^{10^{10^{122}}}$ times that of the observable universe.^[117]
Mathematics: $10^{\,\!10^{10^{963}}}$ , order of magnitude of another upper bound in a proof of Skewes.
Mathematics: Steinhaus' mega lies between 10[4]257 and 10[4]258 (where a[n]b is hyperoperation).
Mathematics: Moser's number, "2 in a mega-gon" in Steinhaus–Moser notation, is approximately equal to 10[10[4]257]10, the last four digits are ...1056.
Mathematics: Graham's number, the last ten digits of which are ...2464195387. Arises as an upper bound solution to a problem in Ramsey theory. Representation in powers of 10 would be impractical (the number of 10s in the power tower $10^{\,\!10^{10^{...}}}$ would be virtually indistinguishable from the number itself).
Mathematics: TREE(3): appears in relation to a theorem on trees in graph theory. Representation of the number is difficult, but one weak lower bound is A^A(187196)(1), where A(n) is a version of the Ackermann function.
Mathematics: SSCG(3): appears in relation to the Robertson–Seymour theorem. Known to be greater than TREE(3).
Mathematics: Transcendental integers: a set of numbers defined in 2000 by Harvey Friedman, appears in proof theory.^[118]
Mathematics: Rayo's number is a large number named after Agustín Rayo which has been claimed to be the largest number to have ever been named.^[119] It was originally defined in a "big number duel" at MIT on 26 January 2007.^[120]

References

^ De Bianchi, Massimiliano Sassoli (2017-12-25), On the quantum "self-teleportation" probability of a human body, Brussels Free University, pp. 1–9, arXiv:1712.08465, Bibcode:2017arXiv171208465S
^ Charles Kittel and Herbert Kroemer (1980). Thermal Physics (2nd ed.). W. H. Freeman Company. p. 53. ISBN 978-0-7167-1088-2.
^ There are around 130,000 letters and 199,749 total characters in Hamlet; 26 letters ×2 for capitalization, 12 for punctuation characters = 64, 64¹⁹⁹⁷⁴⁹ ≈ 10^360,783.
^ Calculated: 365! / 365³⁶⁵ ≈ 1.455×10⁻¹⁵⁷
^ Robert Matthews (22 July 2009). "What are the odds of shuffling a deck of cards into the right order?". Science Focus. Retrieved December 10, 2018.
^ www.BridgeHands.com, Sales. "Probabilities Miscellaneous: Bridge Odds". Archived from the original on 2009-10-03.
^ Wilco, Daniel (16 March 2023). "The absurd odds of a perfect NCAA bracket". NCAA.com. Retrieved 16 April 2023.
^ Walraven, P. L.; Lebeek, H. J. (1963). "Foveal Sensitivity of the Human Eye in the Near Infrared". J. Opt. Soc. Am. 53 (6): 765–766. Bibcode:1963JOSA...53..765W. doi:10.1364/josa.53.000765. PMID 13998626.
^ "Lotto Odds". lottery.co.uk. Retrieved 2024-12-06.
^ Courtney Taylor. "The Probability of Being Dealt a Royal Flush in Poker". ThoughtCo. Retrieved December 10, 2018.
^ (sequence A000396 in the OEIS)
^ "Loya jirga: Afghan elders reject 'pimp's number 39'". BBC News. 17 November 2011. Retrieved 3 April 2025.
^ "Cook Islands 2016 Census Main Report" (PDF). December 6, 2024. Archived from the original (PDF) on October 31, 2020. Retrieved December 6, 2024.
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^ "How many Gmail user accounts are there in the world? | blog.gsmart.in". Retrieved 2020-11-28.
^ Christof Baron (2015). "Facebook users worldwide 2016 | Statista". Statista. statista.com. Archived from the original on 2016-09-09.
^ "Census Bureau Projects U.S. and World Populations on New Year's Day". commerce.gov. 3 January 2024. Retrieved 2 June 2024.
^ ^a ^b "Earth microbes on the moon". Science@Nasa. 1 September 1998. Archived from the original on 23 March 2010. Retrieved 2 November 2010.
^ "How Many Planets are in the Milky Way? | Amount, Location & Key Facts". The Nine Planets. 29 September 2020. Retrieved 2020-11-28.
^ January 2013, Space com Staff 02 (2 January 2013). "100 Billion Alien Planets Fill Our Milky Way Galaxy: Study". Space.com. Retrieved 2020-11-28.{{cite web}}: CS1 maint: numeric names: authors list (link)
^ Elizabeth Howell, How Many Stars Are in the Milky Way? Archived 2016-05-28 at the Wayback Machine, Space.com, 21 May 2014 (citing estimates from 100 to 400 billion).
^ "there was, to our knowledge, no actual, direct estimate of numbers of cells or of neurons in the entire human brain to be cited until 2009. A reasonable approximation was provided by Williams and Herrup (1988), from the compilation of partial numbers in the literature. These authors estimated the number of neurons in the human brain at about 85 billion [...] With more recent estimates of 21–26 billion neurons in the cerebral cortex (Pelvig et al., 2008 ) and 101 billion neurons in the cerebellum (Andersen et al., 1992 ), however, the total number of neurons in the human brain would increase to over 120 billion neurons." Herculano-Houzel, Suzana (2009). "The human brain in numbers: a linearly scaled-up primate brain". Front. Hum. Neurosci. 3: 31. doi:10.3389/neuro.09.031.2009. PMC 2776484. PMID 19915731.
^ Kapitsa, Sergei P (1996). "The phenomenological theory of world population growth". Physics-Uspekhi. 39 (1): 57–71. Bibcode:1996PhyU...39...57K. doi:10.1070/pu1996v039n01abeh000127. S2CID 250877833. (citing the range of 80 to 150 billion, citing K. M. Weiss, Human Biology 56637, 1984, and N. Keyfitz, Applied Mathematical Demography, New York: Wiley, 1977). C. Haub, "How Many People Have Ever Lived on Earth?", Population Today 23.2), pp. 5–6, cited an estimate of 105 billion births since 50,000 BC, updated to 107 billion as of 2011 in Haub, Carl (October 2011). "How Many People Have Ever Lived on Earth?". Population Reference Bureau. Archived from the original on April 24, 2013. Retrieved April 29, 2013. (due to the high infant mortality in pre-modern times, close to half of this number would not have lived past infancy).
^ Rubik's Cube Variants - Jaap's Puzzle Page
^ "Platelets dosing, indications, interactions, adverse effects, and more". reference.medscape.com. Retrieved 2022-10-31.
^ "Prime Number Races" (PDF). granville.dvi. Retrieved 2024-01-04.
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^ Jonathan Amos (3 September 2015). "Earth's trees number 'three trillion'". BBC. Archived from the original on 6 June 2017.
^ Xavier Gourdon (October 2004). "Computation of zeros of the Zeta function". Archived from the original on 15 January 2011. Retrieved 2 November 2010.
^ Hatton, Ian A.; Galbraith, Eric D.; Merleau, Nono S. C.; Miettinen, Teemu P.; Smith, Benjamin McDonald; Shander, Jeffery A. (2023-09-26). "The human cell count and size distribution". Proceedings of the National Academy of Sciences. 120 (39): e2303077120. Bibcode:2023PNAS..12003077H. doi:10.1073/pnas.2303077120. ISSN 0027-8424. PMC 10523466. PMID 37722043.
^ Sender, Ron; Fuchs, Shai; Milo, Ron (2016-08-19). "Revised Estimates for the Number of Human and Bacteria Cells in the Body". PLOS Biology. 14 (8): e1002533. doi:10.1371/journal.pbio.1002533. ISSN 1545-7885. PMC 4991899. PMID 27541692.
^ Haruka Iwao, Emma (14 March 2019). "Pi in the sky: Calculating a record-breaking 31.4 trillion digits of Archimedes' constant on Google Cloud". Archived from the original on 19 October 2019. Retrieved 12 April 2019.
^ Alexander Yee, ed. (2 April 2025). "y-cruncher - A Multi-Threaded Pi Program". Numberworld.
^ Koch, Christof. Biophysics of computation: information processing in single neurons. Oxford university press, 2004.
^ Savage, D. C. (1977). "Microbial Ecology of the Gastrointestinal Tract". Annual Review of Microbiology. 31: 107–33. doi:10.1146/annurev.mi.31.100177.000543. PMID 334036.
^ Berg, R. (1996). "The indigenous gastrointestinal microflora". Trends in Microbiology. 4 (11): 430–5. doi:10.1016/0966-842X(96)10057-3. PMID 8950812.
^ ^a ^b ^c Sloane, N. J. A. (ed.). "Sequence A186311 (Least century 100k to 100k+99 with exactly n primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-06-16.
^ Bert Holldobler and E.O. Wilson The Superorganism: The Beauty, Elegance, and Strangeness of Insect Societies New York:2009 W.W. Norton Page 5
^ "VDURA and Phison Demonstrate Show of Strength at SC24 - Strongman Hafþór Júlíus Björnsson Lifts Over 282.624 PB of Data". www.businesswire.com (Press release). Retrieved 20 November 2024.
^ Silva, Tomás Oliveira e. "Goldbach conjecture verification". Retrieved 11 April 2021.
^ "60th Birthday of Microelectronics Industry". Semiconductor Industry Association. 13 December 2007. Archived from the original on 13 October 2008. Retrieved 2 November 2010.
^ Sequence A131646 Archived 2011-09-01 at the Wayback Machine in The On-Line Encyclopedia of Integer Sequences
^ "Smithsonian Encyclopedia: Number of Insects Archived 2016-12-28 at the Wayback Machine". Prepared by the Department of Systematic Biology, Entomology Section, National Museum of Natural History, in cooperation with Public Inquiry Services, Smithsonian Institution. Accessed 27 December 2016. Facts about numbers of insects. Puts the number of individual insects on Earth at about 10 quintillion (10¹⁹).
^ Ivan Moscovich, 1000 playthinks: puzzles, paradoxes, illusions & games, Workman Pub., 2001 ISBN 0-7611-1826-8.
^ "Will YouTube Ever Run Out Of Video IDs?". Tom Scott.
^ "Scores of Zimbabwe farms 'seized'". BBC. 23 February 2009. Archived from the original on 1 March 2009. Retrieved 14 March 2009.
^ (sequence A137214 in the OEIS)
^ "To see the Universe in a Grain of Taranaki Sand". Archived from the original on 2012-06-30.
^ "Intel predicts 1,200 quintillion transistors in the world by 2015". Archived from the original on 2013-04-05.
^ "How Many Transistors Have Ever Shipped? – Forbes". Forbes. Archived from the original on 30 June 2015. Retrieved 1 September 2015.
^ "Sudoku enumeration". Archived from the original on 2006-10-06.
^ (sequence A050726 in the OEIS)
^ "Star count: ANU astronomer makes best yet". The Australian National University. 17 July 2003. Archived from the original on July 24, 2005. Retrieved 2 November 2010.
^ "Astronomers count the stars". BBC News. July 22, 2003. Archived from the original on August 13, 2006. Retrieved 2006-07-18. "trillions-of-earths-could-be-orbiting-300-sextillion-stars" van Dokkum, Pieter G.; Charlie Conroy (2010). "A substantial population of low-mass stars in luminous elliptical galaxies". Nature. 468 (7326): 940–942. arXiv:1009.5992. Bibcode:2010Natur.468..940V. doi:10.1038/nature09578. PMID 21124316. S2CID 205222998. "How many stars?" Archived 2013-01-22 at the Wayback Machine; see mass of the observable universe
^ (sequence A007377 in the OEIS)
^ "Questions and Answers – How many atoms are in the human body?". Archived from the original on 2003-10-06.
^ William B. Whitman; David C. Coleman; William J. Wiebe (1998). "Prokaryotes: The unseen majority". Proceedings of the National Academy of Sciences of the United States of America. 95 (12): 6578–6583. Bibcode:1998PNAS...95.6578W. doi:10.1073/pnas.95.12.6578. PMC 33863. PMID 9618454.
^ (sequence A070177 in the OEIS)
^ (sequence A030700 in the OEIS)
^ (sequence A035064 in the OEIS)
^ Nuwer R (18 July 2015). "Counting All the DNA on Earth". The New York Times. New York. ISSN 0362-4331. Archived from the original on 2022-01-01. Retrieved 2025-03-28.
^ (sequence A050723 in the OEIS)
^ (sequence A008839 in the OEIS)
^ John Tromp (2010). "John's Chess Playground". Archived from the original on 2014-06-01.
^ ^a ^b Merickel, James G. (ed.). "Sequence A217379 (Numbers having non-pandigital power of record size (excludes multiples of 10).)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2021-03-17.
^ Planck Collaboration (2016). "Planck 2015 results. XIII. Cosmological parameters (See Table 4 on page 31 of pfd)". Astronomy & Astrophysics. 594: A13. arXiv:1502.01589. Bibcode:2016A&A...594A..13P. doi:10.1051/0004-6361/201525830. S2CID 119262962.
^ (sequence A050724 in the OEIS)
^ Paul Zimmermann, "50 largest factors found by ECM Archived 2009-02-20 at the Wayback Machine".
^ Matthew Champion, "Re: How many atoms make up the universe?" Archived 2012-05-11 at the Wayback Machine, 1998
^ WMAP- Content of the Universe Archived 2016-07-26 at the Wayback Machine. Map.gsfc.nasa.gov (2010-04-16). Retrieved on 2011-05-01.
^ "Names of large and small numbers". bmanolov.free.fr. Miscellaneous pages by Borislav Manolov. Archived from the original on 2016-09-30.
^ "Prime Curios! 68647...57151 (157-digits)". t5k.org. Retrieved 2025-04-03.
^ Hanke, Steve; Krus, Nicholas. "Hyperinflation Table" (PDF). Retrieved 26 March 2021.
^ "Richard Eldridge". Archived from the original on October 3, 2020.
^ "The Top Twenty: Fibonacci Number". primes.utm.edu. Retrieved 25 March 2025.
^ "The Top Twenty: Lucas Number". primes.utm.edu. Retrieved 2 April 2025.
^ Chris Caldwell, The Top Twenty: Elliptic Curve Primality Proof at The Prime Pages.
^ Chris Caldwell, The Top Twenty: Sophie Germain (p) at The Prime Pages.
^ Chris Caldwell, The Top Twenty: Twin at The Prime Pages.
^ "Henri & Renaud Lifchitz's PRP Top - Search by form". www.primenumbers.net. Retrieved 2 April 2025.
^ Chris Caldwell, The Top Twenty: Primorial at The Prime Pages.
^ From the third paragraph of the story: "Each book contains 410 pages; each page, 40 lines; each line, about 80 black letters." That makes 410 x 40 x 80 = 1,312,000 characters. The fifth paragraph tells us that "there are 25 orthographic symbols" including spaces and punctuation. The magnitude of the resulting number is found by taking logarithms. However, this calculation only gives a lower bound on the number of books as it does not take into account variations in the titles – the narrator does not specify a limit on the number of characters on the spine. For further discussion of this, see Bloch, William Goldbloom. The Unimaginable Mathematics of Borges' Library of Babel. Oxford University Press: Oxford, 2008.
^ Chris Caldwell, The Top Twenty: Palindrome at The Prime Pages.
^ Gary Barnes, Riesel conjectures and proofs Archived 2021-04-12 at the Wayback Machine
^ ^a ^b ^c Chris Caldwell, Mersenne Primes: History, Theorems and Lists at The Prime Pages.
^ PRP Top Records, Search for : F(n). Retrieved 2025-03-25.
^ Chris Caldwell, The Top Twenty: Factorial primes Archived 2013-04-10 at the Wayback Machine at The Prime Pages.
^ Caldwell, Chris, "The largest known primes", The Prime Pages, retrieved 7 April 2025; "The Prime Database: 81*2^20498148+1", The Prime Pages, retrieved 7 April 2025
^ Chris Caldwell, The Top Twenty: Generalized Fermat Archived 2021-03-28 at the Wayback Machine at The Prime Pages.
^ PRP records
^ Chris Caldwell, The Top Twenty: Proth Archived 2020-11-24 at the Wayback Machine at The Prime Pages.
^ ^a ^b ^c Chris Caldwell, The Top Twenty: Largest Known Primes at The Prime Pages.
^ asantos (15 December 2007). "Googol and Googolplex by Carl Sagan". Archived from the original on 2021-12-12 – via YouTube.
^ Zyga, Lisa "Physicists Calculate Number of Parallel Universes" Archived 2011-06-06 at the Wayback Machine, PhysOrg, 16 October 2009.
^ Don N. Page for Cornell University (2007). "Susskind's challenge to the Hartle–Hawking no-boundary proposal and possible resolutions". Journal of Cosmology and Astroparticle Physics. 2007 (1): 004. arXiv:hep-th/0610199. Bibcode:2007JCAP...01..004P. doi:10.1088/1475-7516/2007/01/004. S2CID 17403084.
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^ Kerr, Josh (7 December 2013). "Name the biggest number contest". Archived from the original on 20 March 2016. Retrieved 27 March 2014.

External links

Seth Lloyd's paper Computational capacity of the universe provides a number of interesting dimensionless quantities.
Notable properties of specific numbers
Clewett, James. "4,294,967,296 – The Internet is Full". Numberphile. Brady Haran. Archived from the original on 2013-05-24. Retrieved 2013-04-06.

[1] De Bianchi, Massimiliano Sassoli (2017-12-25), On the quantum "self-teleportation" probability of a human body, Brussels Free University, pp. 1–9, arXiv:1712.08465, Bibcode:2017arXiv171208465S

[2] Charles Kittel and Herbert Kroemer (1980). Thermal Physics (2nd ed.). W. H. Freeman Company. p. 53. ISBN 978-0-7167-1088-2.

[3] There are around 130,000 letters and 199,749 total characters in Hamlet; 26 letters ×2 for capitalization, 12 for punctuation characters = 64, 64¹⁹⁹⁷⁴⁹ ≈ 10^360,783.

[4] Calculated: 365! / 365³⁶⁵ ≈ 1.455×10⁻¹⁵⁷

[5] Robert Matthews (22 July 2009). "What are the odds of shuffling a deck of cards into the right order?". Science Focus. Retrieved December 10, 2018.

[6] www.BridgeHands.com, Sales. "Probabilities Miscellaneous: Bridge Odds". Archived from the original on 2009-10-03.

[7] Wilco, Daniel (16 March 2023). "The absurd odds of a perfect NCAA bracket". NCAA.com. Retrieved 16 April 2023.

[8] Walraven, P. L.; Lebeek, H. J. (1963). "Foveal Sensitivity of the Human Eye in the Near Infrared". J. Opt. Soc. Am. 53 (6): 765–766. Bibcode:1963JOSA...53..765W. doi:10.1364/josa.53.000765. PMID 13998626.

[9] "Lotto Odds". lottery.co.uk. Retrieved 2024-12-06.

[10] Courtney Taylor. "The Probability of Being Dealt a Royal Flush in Poker". ThoughtCo. Retrieved December 10, 2018.

[11] (sequence A000396 in the OEIS)

[12] "Loya jirga: Afghan elders reject 'pimp's number 39'". BBC News. 17 November 2011. Retrieved 3 April 2025.

[13] "Cook Islands 2016 Census Main Report" (PDF). December 6, 2024. Archived from the original (PDF) on October 31, 2020. Retrieved December 6, 2024.

[14] Peterson-Withorn, Chase. "Forbes' 38th Annual World's Billionaires List: Facts And Figures 2024". Forbes. Retrieved 2025-03-26.

[15] Mason, W S; Seal, G; Summers, J (1980-12-01). "Virus of Pekin ducks with structural and biological relatedness to human hepatitis B virus". Journal of Virology. 36 (3): 829–836. doi:10.1128/JVI.36.3.829-836.1980. ISSN 0022-538X. PMC 353710. PMID 7463557.

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[44] "there was, to our knowledge, no actual, direct estimate of numbers of cells or of neurons in the entire human brain to be cited until 2009. A reasonable approximation was provided by Williams and Herrup (1988), from the compilation of partial numbers in the literature. These authors estimated the number of neurons in the human brain at about 85 billion [...] With more recent estimates of 21–26 billion neurons in the cerebral cortex (Pelvig et al., 2008 ) and 101 billion neurons in the cerebellum (Andersen et al., 1992 ), however, the total number of neurons in the human brain would increase to over 120 billion neurons." Herculano-Houzel, Suzana (2009). "The human brain in numbers: a linearly scaled-up primate brain". Front. Hum. Neurosci. 3: 31. doi:10.3389/neuro.09.031.2009. PMC 2776484. PMID 19915731.

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[Savage1977-57] Savage, D. C. (1977). "Microbial Ecology of the Gastrointestinal Tract". Annual Review of Microbiology. 31: 107–33. doi:10.1146/annurev.mi.31.100177.000543. PMID 334036.

[Berg1996-58] Berg, R. (1996). "The indigenous gastrointestinal microflora". Trends in Microbiology. 4 (11): 430–5. doi:10.1016/0966-842X(96)10057-3. PMID 8950812.

[A186311-59] Sloane, N. J. A. (ed.). "Sequence A186311 (Least century 100k to 100k+99 with exactly n primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-06-16.

[60] Bert Holldobler and E.O. Wilson The Superorganism: The Beauty, Elegance, and Strangeness of Insect Societies New York:2009 W.W. Norton Page 5

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[65] "Smithsonian Encyclopedia: Number of Insects Archived 2016-12-28 at the Wayback Machine". Prepared by the Department of Systematic Biology, Entomology Section, National Museum of Natural History, in cooperation with Public Inquiry Services, Smithsonian Institution. Accessed 27 December 2016. Facts about numbers of insects. Puts the number of individual insects on Earth at about 10 quintillion (10¹⁹).

[66] Ivan Moscovich, 1000 playthinks: puzzles, paradoxes, illusions & games, Workman Pub., 2001 ISBN 0-7611-1826-8.

[67] "Will YouTube Ever Run Out Of Video IDs?". Tom Scott.

[68] "Scores of Zimbabwe farms 'seized'". BBC. 23 February 2009. Archived from the original on 1 March 2009. Retrieved 14 March 2009.

[69] (sequence A137214 in the OEIS)

[70] "To see the Universe in a Grain of Taranaki Sand". Archived from the original on 2012-06-30.

[71] "Intel predicts 1,200 quintillion transistors in the world by 2015". Archived from the original on 2013-04-05.

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[73] "Sudoku enumeration". Archived from the original on 2006-10-06.

[74] (sequence A050726 in the OEIS)

[75] "Star count: ANU astronomer makes best yet". The Australian National University. 17 July 2003. Archived from the original on July 24, 2005. Retrieved 2 November 2010.

[76] "Astronomers count the stars". BBC News. July 22, 2003. Archived from the original on August 13, 2006. Retrieved 2006-07-18. "trillions-of-earths-could-be-orbiting-300-sextillion-stars" van Dokkum, Pieter G.; Charlie Conroy (2010). "A substantial population of low-mass stars in luminous elliptical galaxies". Nature. 468 (7326): 940–942. arXiv:1009.5992. Bibcode:2010Natur.468..940V. doi:10.1038/nature09578. PMID 21124316. S2CID 205222998. "How many stars?" Archived 2013-01-22 at the Wayback Machine; see mass of the observable universe

[77] (sequence A007377 in the OEIS)

[78] "Questions and Answers – How many atoms are in the human body?". Archived from the original on 2003-10-06.

[79] William B. Whitman; David C. Coleman; William J. Wiebe (1998). "Prokaryotes: The unseen majority". Proceedings of the National Academy of Sciences of the United States of America. 95 (12): 6578–6583. Bibcode:1998PNAS...95.6578W. doi:10.1073/pnas.95.12.6578. PMC 33863. PMID 9618454.

[80] (sequence A070177 in the OEIS)

[81] (sequence A030700 in the OEIS)

[82] (sequence A035064 in the OEIS)

[NYT-20150718-rn-83] Nuwer R (18 July 2015). "Counting All the DNA on Earth". The New York Times. New York. ISSN 0362-4331. Archived from the original on 2022-01-01. Retrieved 2025-03-28.

[84] (sequence A050723 in the OEIS)

[85] (sequence A008839 in the OEIS)

[86] John Tromp (2010). "John's Chess Playground". Archived from the original on 2014-06-01.

[A217379-87] Merickel, James G. (ed.). "Sequence A217379 (Numbers having non-pandigital power of record size (excludes multiples of 10).)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2021-03-17.

[Planck_2015-88] Planck Collaboration (2016). "Planck 2015 results. XIII. Cosmological parameters (See Table 4 on page 31 of pfd)". Astronomy & Astrophysics. 594: A13. arXiv:1502.01589. Bibcode:2016A&A...594A..13P. doi:10.1051/0004-6361/201525830. S2CID 119262962.

[89] (sequence A050724 in the OEIS)

[90] Paul Zimmermann, "50 largest factors found by ECM Archived 2009-02-20 at the Wayback Machine".

[91] Matthew Champion, "Re: How many atoms make up the universe?" Archived 2012-05-11 at the Wayback Machine, 1998

[nasawmap-92] WMAP- Content of the Universe Archived 2016-07-26 at the Wayback Machine. Map.gsfc.nasa.gov (2010-04-16). Retrieved on 2011-05-01.

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[95] Hanke, Steve; Krus, Nicholas. "Hyperinflation Table" (PDF). Retrieved 26 March 2021.

[96] "Richard Eldridge". Archived from the original on October 3, 2020.

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[98] "The Top Twenty: Lucas Number". primes.utm.edu. Retrieved 2 April 2025.

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[100] Chris Caldwell, The Top Twenty: Sophie Germain (p) at The Prime Pages.

[101] Chris Caldwell, The Top Twenty: Twin at The Prime Pages.

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[104] From the third paragraph of the story: "Each book contains 410 pages; each page, 40 lines; each line, about 80 black letters." That makes 410 x 40 x 80 = 1,312,000 characters. The fifth paragraph tells us that "there are 25 orthographic symbols" including spaces and punctuation. The magnitude of the resulting number is found by taking logarithms. However, this calculation only gives a lower bound on the number of books as it does not take into account variations in the titles – the narrator does not specify a limit on the number of characters on the spine. For further discussion of this, see Bloch, William Goldbloom. The Unimaginable Mathematics of Borges' Library of Babel. Oxford University Press: Oxford, 2008.

[105] Chris Caldwell, The Top Twenty: Palindrome at The Prime Pages.

[106] Gary Barnes, Riesel conjectures and proofs Archived 2021-04-12 at the Wayback Machine

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[prptop-108] PRP Top Records, Search for : F(n). Retrieved 2025-03-25.

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Orders of magnitude (numbers)

Smaller than 10−100 (one googolth)

10−100 to 10−30

10−30

10−27

10−24

10−21

10−18

10−15

10−12

10−9

10−6

10−3

10−2

10−1

100

101

102

103

104

105

106

107

108

109

1010

1011

1012

1015

1018

1021

1024

1027

1030

1033

1036

1039

1042 to 1063

1063 to 10100

10100 (one googol) to 101000

101000 to 101,000,000

101,000,000 to 1010100 (one googolplex)

Larger than 1010100

See also