Project Euler | Problem 16 | Power digit sum

Problem Description:

2^15= 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.

What is the sum of the digits of the number 2^1000 ?

Figure1

Concept:

As result of 2^1000 is very big and we can't store it in any primitive data type so to solve this problem we need to use methods of BigInteger class present in java.math.* package.

Java Program:

Output:

Figure2

Similar Problems:

How to calculate factorial of large number?

How to find first 10 digits of large sum?

References:

https://projecteuler.net/problem=16
https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html

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