31856473516 has 12 divisors (see below), whose sum is σ = 63712947088. Its totient is φ = 13652774352.

The previous prime is 31856473501. The next prime is 31856473547. The reversal of 31856473516 is 61537465813.

31856473516 is an admirable number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31856473516.

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, 568865571 + ... + 568865626.

Almost surely, 2^31856473516 is an apocalyptic number.

It is an amenable number.

31856473516 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.

31856473516 is a wasteful number, since it uses less digits than its factorization.

31856473516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137731208 (or 1137731206 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 49.

The spelling of 31856473516 in words is "thirty-one billion, eight hundred fifty-six million, four hundred seventy-three thousand, five hundred sixteen".