31860618016 has 24 divisors (see below), whose sum is σ = 63219502080. Its totient is φ = 15804871488.

The previous prime is 31860618007. The next prime is 31860618043. The reversal of 31860618016 is 61081606813.

It is a super-2 number, since 2×31860618016² (a number of 22 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 31860618016.

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, 3915796 + ... + 3923923.

It is an arithmetic number, because the mean of its divisors is an integer number (2634145920).

Almost surely, 2^31860618016 is an apocalyptic number.

It is an amenable number.

31860618016 is a deficient number, since it is larger than the sum of its proper divisors (31358884064).

31860618016 is a wasteful number, since it uses less digits than its factorization.

31860618016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7839856 (or 7839848 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 31860618016 in words is "thirty-one billion, eight hundred sixty million, six hundred eighteen thousand, sixteen".