## googolA named coined in 1938 by Milton Sirotta, the nine-year-old nephew of the mathematician Edward Kasner, when the child was asked by his uncle to come up with a name for a very large number; at the same time, googolplex was suggested for a still larger
number. Kasner defined these numbers as follows:1 googol = 10 ^{100} (i.e. 1 followed by 100 zeros);1 googolplex = 10 ^{googol} = 10^{10^100} (i.e. 1 followed
by a googol number of zeros).A googol is very roughly the number of years thought to be needed for all the black holes in the universe to evaporate by a process known as Hawking radiation. It is much larger than the number of protons and neutrons in the known universe (about 10 ^{80}), but much smaller than the number of protons and
neutrons needed to pack every cubic centimeter of the known universe (about
10^{128}). The googolplex is the largest number with a proper name
of which many people have heard. It is dwarfed, however, by such esoterica
as Graham's Number. ## Related category• NOTABLE NUMBERS | |||||

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