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A googol is a large number equal to 10^{102} or 10^{100}. In other terms, the digit 1 with 100 zeros following it. Written out explicitly, 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.

The term was coined in 1920 by 9-year-old Milton Sirotta (1911–1981), nephew of U.S. mathematician Edward Kasner. Kasner popularized the concept in his 1940 book Mathematics and the Imagination. Other names for googol include ten duotrigintillion on the short scale, ten thousand sexdecillion on the long scale, or ten sexdecilliard on the Peletier long scale.

A googol has no special significance in mathematics. However, it is useful when comparing with other very large quantities such as the number of subatomic particles in the visible universe or the number of hypothetical possibilities in a chess game. Kasner used it to illustrate the difference between an unimaginably large number and infinity, and in this role it is sometimes used in teaching mathematics. To give a sense of how big a googol really is, the mass of an electron, just under 10^{-30} kg, can be compared to the mass of the visible universe, estimated at between 10^{50} and 10^{60} kg. It is a ratio in the order of about 10^{80} to 10^{90}, or at most one ten-billionth of a googol (0.00000001% of a googol).

Carl Sagan pointed out that the total number of elementary particles in the universe is around 10^{80} (the Eddington number) and that if the whole universe were packed with neutrons so that there would be no empty space anywhere, there would be around 10^{128}. He also noted the similarity of the second calculation to that of Archimedes in The Sand Reckoner. By Archimedes's calculation, the universe of Aristarchus (roughly 2 light years in diameter), if fully packed with sand, would contain 10^{63} grains. If the much larger observable universe of today were filled with sand, it would still only equal 10^{95} grains. Another 100,000 observable universes filled with sand would be necessary to make a googol. The decay time for a supermassive black hole of roughly 1 galaxy-mass (10^{11} solar masses) due to Hawking radiation is on the order of 10^{100} years. Therefore, the heat death of an expanding universe is lower-bounded to occur at least one googol years in the future.

A googol is approximately 70! (factorial of 70). Using an integral, binary numeral system, one would need 333 bits to represent a googol, i.e., 1 googol = 2^{100/log102} ≈ 2^{332.19280949}. However, a googol is well within the maximum bounds of an IEEE 754 double-precision floating point type, but without full precision in the mantissa.

A googol has no special significance in mathematics. However, it is useful when comparing with other very large quantities such as the number of subatomic particles in the visible universe or the number of hypothetical possibilities in a chess game. Kasner used it to illustrate the difference between an unimaginably large number and infinity, and in this role it is sometimes used in teaching mathematics. To give a sense of how big a googol really is, the mass of an electron, just under 10^{-30} kg, can be compared to the mass of the visible universe, estimated at between 10^{50} and 10^{60} kg. It is a ratio in the order of about 10^{80} to 10^{90}, or at most one ten-billionth of a googol (0.00000001% of a googol).

0, 0, 1, 0, 0, 4, 4, 0, 1, 0, 1, 4, 3, 4, 10, 0, 4, 10, 9, 0, 4, 12, 13, 16, 0, 16, 10, 4, 16, 10, 5, 0, 1, 4, 25, 28, 10, 28, 16, 0, 1, 4, 31, 12, 10, 36, 27, 16, 11, 0, ... (sequence A066298 in the OEIS)

This sequence is the same as that of the residues (mod n) of a googolplex up until the 17th position.

Widespread sounding of the word occurs through the name of the company Google, with the name Google being an accidental misspelling of googol by the company's founders, which was picked to signify that the search engine was intended to provide large quantities of information. In 2004, family members of Kasner, who had inherited the right to his book, were considering suing Google for their use of the term googol; however, no suit was ever filed.

Since October 2009, Google has been assigning domain names to its servers under the domain 1e100.net, the scientific notation for 1 googol, in order to provide a single domain to identify servers across the Google network.

The word is notable for being the subject of the £1 million question in a 2001 episode of the British quiz show Who Wants to Be a Millionaire?, when contestant Charles Ingram cheated his way through the show with the help of a confederate in the studio audience.

“Googol.” From Wolfram MathWorld, mathworld.wolfram.com/Googol.html.

“Googol.” Wikipedia, Wikimedia Foundation, 2 May 2020, en.wikipedia.org/wiki/Googol.

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