31909642664 has 32 divisors (see below), whose sum is σ = 62711953920. Its totient is φ = 15192678336.

The previous prime is 31909642657. The next prime is 31909642691. The reversal of 31909642664 is 46624690913.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347807 + ... + 429870.

It is an arithmetic number, because the mean of its divisors is an integer number (1959748560).

Almost surely, 2^31909642664 is an apocalyptic number.

It is an amenable number.

31909642664 is a deficient number, since it is larger than the sum of its proper divisors (30802311256).

31909642664 is a wasteful number, since it uses less digits than its factorization.

31909642664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777929 (or 777925 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 31909642664 in words is "thirty-one billion, nine hundred nine million, six hundred forty-two thousand, six hundred sixty-four".