A googol is 10^100 (10 with 100 zeroes after it)

A googolplex is 10^100^100 (10 with a googol of zeroes after it) - so big infact that there is not enough space in the known universe to write it down.

However; I have come up with the ULTIMATE BIG number. I call it the "Hopkiplex" (named after me; (who thought it up) - naturally)

The Hopkiplex is a googolplex to the power of a googolplex; a googolplex of times...i.e. googolplex^googolplex^googolplex^googolplex.....et c....

The short way of writing down the Hopkiplex will be "hPx" (A lowecase "h", and an upper "P" and a lowercase "x")