StackOverflowError computing factorial of a BigInteger?

Question

I am trying to write a Java program to calculate factorial of a large number. It seems BigInteger is not able to hold such a large number.

The below is

Answer 1

Naive implementations of factorial don't work out in real situations.

If you have a serious need, the best thing to do is to write a gamma function (or ln(gamma) function) that will work not only for integers but is also correct for decimal numbers. Memoize results so you don't have to keep repeating calculations using a WeakHashMap and you're in business.