# googol

Google and googol, not to be confused. However, the name of the search engine was inspired by the name of the number, which, in turn, was coined by a nine-year-old boy!

The name 'googol' was 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.