631994564664 has 96 divisors (see below), whose sum is σ = 1715823149040. Its totient is φ = 210151987200.

The previous prime is 631994564653. The next prime is 631994564701. The reversal of 631994564664 is 466465499136.

631994564664 is a `hidden beast` number, since 6 + 3 + 1 + 9 + 9 + 4 + 564 + 6 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77436744 + ... + 77444904.

Almost surely, 2^631994564664 is an apocalyptic number.

It is an amenable number.

631994564664 is an abundant number, since it is smaller than the sum of its proper divisors (1083828584376).

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

631994564664 is a wasteful number, since it uses less digits than its factorization.

631994564664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661 (or 10654 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 63.

The spelling of 631994564664 in words is "six hundred thirty-one billion, nine hundred ninety-four million, five hundred sixty-four thousand, six hundred sixty-four".