Googol

Googol is a large number, equal to $$10^{100}$$ or 1 followed by 100 zeroes. It was coined by Edward Kasner's nine-year-old nephew, Milton Sirotta. The name appears to have no particular meaning.

The googol is shown below.

10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

The googol, in the American system, is equal to ten duotrigintillion, or ten sexdecilliard in the British system.

There are not enough particles in the known universe to match a googol, although the number itself is dwarfed by many other more massive numbers.