631891977216 has 88 divisors (see below), whose sum is σ = 1704515021664. Its totient is φ = 208092856320.

The previous prime is 631891977187. The next prime is 631891977229. The reversal of 631891977216 is 612779198136.

It is a super-2 number, since 2×631891977216² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 631891977216.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984145 + ... + 1494096.

Almost surely, 2^631891977216 is an apocalyptic number.

It is an amenable number.

631891977216 is an abundant number, since it is smaller than the sum of its proper divisors (1072623044448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631891977216 is a wasteful number, since it uses less digits than its factorization.

631891977216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478347 (or 2478329 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 60.

The spelling of 631891977216 in words is "six hundred thirty-one billion, eight hundred ninety-one million, nine hundred seventy-seven thousand, two hundred sixteen".