Developer's DescriptionBy MicroTools4UPerform calculations with big natural numbers.This is a program for calculations with big natural numbers. How big it can be - in binary presentation upto 2 ** 64 bits... To speed it up it also has 2 ** 32 indexing version BigNumbers32.exe. It calculates also something from combinatorics: Pn, An, Cn. P(n) = n!; A(n, k) = n! / (n - k)!; C(n, k) = n! / ((n - k)! * k!).