31661951216 has 40 divisors (see below), whose sum is σ = 70152471264. Its totient is φ = 13560917760.

The previous prime is 31661951213. The next prime is 31661951227. The reversal of 31661951216 is 61215916613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661951213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93026 + ... + 268286.

Almost surely, 2^31661951216 is an apocalyptic number.

It is an amenable number.

31661951216 is an abundant number, since it is smaller than the sum of its proper divisors (38490520048).

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

31661951216 is a wasteful number, since it uses less digits than its factorization.

31661951216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176889 (or 176883 counting only the distinct ones).

The product of its digits is 58320, while the sum is 41.

The spelling of 31661951216 in words is "thirty-one billion, six hundred sixty-one million, nine hundred fifty-one thousand, two hundred sixteen".