631688177939 has 16 divisors (see below), whose sum is σ = 778508838912. Its totient is φ = 499124511648.

The previous prime is 631688177899. The next prime is 631688178029. The reversal of 631688177939 is 939771886136.

It is a de Polignac number, because none of the positive numbers 2^k-631688177939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631688177339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4603739 + ... + 4738964.

It is an arithmetic number, because the mean of its divisors is an integer number (48656802432).

Almost surely, 2^631688177939 is an apocalyptic number.

631688177939 is a deficient number, since it is larger than the sum of its proper divisors (146820660973).

631688177939 is a wasteful number, since it uses less digits than its factorization.

631688177939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9343466.

The product of its digits is 82301184, while the sum is 68.

The spelling of 631688177939 in words is "six hundred thirty-one billion, six hundred eighty-eight million, one hundred seventy-seven thousand, nine hundred thirty-nine".