Simple program written in Java to calculate Big Integer factorial.

import java.lang.String;
import java.math.BigInteger;
import java.util.Scanner;

// ? 2017 TheFlyingKeyboard and released under MIT License

public class Main {
  public static void main(String []args){		
    Scanner reader = new Scanner(;
    int n; 	
    System.out.println("Enter a number: ");
    n = reader.nextInt(); //Reads integer from keyboard			
  static BigInteger factorial(int N){
    BigInteger f = new BigInteger("1"); 
    for (int i = 2; i <= N; i++){
       f = f.multiply(BigInteger.valueOf(i));
    return f;


Java BigInt Factorial
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