Is there intelligent life on this site? It's debatable. Just because I can write a number down DOES NOT make it real. Something like googol! (googol factorial)is NOT REAL. It denotes NOTHING. It's imaginary. Theoretical. Infinity is a CONCEPT (infinity cannot exist). If infinity were to exist, then my point would be proven because infinite time and space means infinite atoms. GOTCHA!
you are correct on one point, infinity is a concept, it does not exist. However, googol is a number and therefore so is googol! (though it is a really big number). Each number is as real as the number that came before it.
Combinations of atoms don't work the way most of you have calculated. They exist in space, not on a sequence.