What is 15511210043331000000000000?

Answer 1

15511210043331000000000000 is the

number of possible permutations with n=25.

Permutation is every combination of number you can get.

For instance n=2, take 2 numbers 4 and 5 --> all possible combinations are 45 and 54, so only two.

15511210043331000000000000 are needed to get it from 25 numbers.

It is also 1*2*3....25

http://www.mathsisfun.com/numbers/factorial.html