A googol is equal to a 1 followed by 100 zeros:

**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**

which can be written in a shorter form as

**10 ^{10 X 10}**

or as

**10 ^{100}**

If you know what a googol is, can you guess what a googolplex is? It’s 10 to a googol…

**10 ^{10100}**

Hat tip to The Almighty Googolplex – which also gives estimates of how long it would take to count from one to one million, one billion and one googol! “Carl Sagan explained (in *COSMOS*) that in order to write down the long form of a googolplex, you would need more paper than you could possibly stuff into the entire known universe!!!”