31659509644 has 12 divisors (see below), whose sum is σ = 63319019344. Its totient is φ = 13568361264.

The previous prime is 31659509627. The next prime is 31659509657. The reversal of 31659509644 is 44690595613.

It is a happy number.

31659509644 is an admirable number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31659509591 and 31659509600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565348359 + ... + 565348414.

Almost surely, 2^31659509644 is an apocalyptic number.

It is an amenable number.

31659509644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31659509644 is a wasteful number, since it uses less digits than its factorization.

31659509644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130696784 (or 1130696782 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 31659509644 in words is "thirty-one billion, six hundred fifty-nine million, five hundred nine thousand, six hundred forty-four".