31997017668 has 48 divisors (see below), whose sum is σ = 93082235904. Its totient is φ = 8310913440.

The previous prime is 31997017639. The next prime is 31997017669. The reversal of 31997017668 is 86671079913.

It is not an unprimeable number, because it can be changed into a prime (31997017669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17313480 + ... + 17315327.

It is an arithmetic number, because the mean of its divisors is an integer number (1939213248).

Almost surely, 2^31997017668 is an apocalyptic number.

It is an amenable number.

31997017668 is an abundant number, since it is smaller than the sum of its proper divisors (61085218236).

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

31997017668 is a wasteful number, since it uses less digits than its factorization.

31997017668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34628832 (or 34628830 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 57.

The spelling of 31997017668 in words is "thirty-one billion, nine hundred ninety-seven million, seventeen thousand, six hundred sixty-eight".