Given that there are an estimated 1080 particles in the known universe, and the estimated number of grains of sand that the entire known universe could hold (given average size of a grain of sand) is estimated at 1090, and the quantity of planck volumes that would fit in the known universe is approximately 10183, I think we've reached the point where the number of possibilities are indistinguishable from infinite.
I typed in the wrong number. Here is the correct number:
9.2323412683466475285638791370210766478370544416421428... × 10
2408239http://www.wolframalpha.com/input/?i=2^8%2C000%2C000Still beyond astronomical though, lol.
Still much smaller than a googolplex,...so
not very impressive as far as "large numbers" go. hehe.
Also still wondering why Satoshi decided we should
be using double hashes in the Merkle tree.