31640665000 has 80 divisors (see below), whose sum is σ = 84724754400. Its totient is φ = 10848216000.

The previous prime is 31640664961. The next prime is 31640665019. The reversal of 31640665000 is 56604613.

It is a super-2 number, since 2×31640665000² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 417010 + ... + 487009.

It is an arithmetic number, because the mean of its divisors is an integer number (1059059430).

Almost surely, 2^31640665000 is an apocalyptic number.

It is an amenable number.

31640665000 is an abundant number, since it is smaller than the sum of its proper divisors (53084089400).

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

31640665000 is an equidigital number, since it uses as much as digits as its factorization.

31640665000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904052 (or 904033 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 31640665000 in words is "thirty-one billion, six hundred forty million, six hundred sixty-five thousand".