There is enough to concrete to in the Hoover Dam to wrap around the equator of the earth in a 4ft strip.
A googol is 10^100 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
A googolplex is 10^googol 10^(10^100)
http://en.wikipedia.org/wiki/Googolplex the most interesting number in the world.
Consider printing the digits of a googolplex in unreadable, one-point font (0.353 mm per digit). It would take about 3.5 × 1096 metres to write a googolplex in one-point font. The observable universe is estimated to be 8.80 × 1026 meters, or 93 billion light-years, in diameter,[3] so the distance required to write the necessary zeroes is longer than the estimated universe.
Graham's number bigger than a googleplex
http://en.wikipedia.org/wiki/Graham%27s_number
Lol wiki has interesting facts in it.