31640888757668 has 48 divisors (see below), whose sum is σ = 56507251262784. Its totient is φ = 15498148659840.

The previous prime is 31640888757661. The next prime is 31640888757703. The reversal of 31640888757668 is 86675788804613.

It is a super-2 number, since 2×31640888757668² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31640888757661) 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, 86679671 + ... + 87043937.

It is an arithmetic number, because the mean of its divisors is an integer number (1177234401308).

Almost surely, 2^{31640888757668} is an apocalyptic number.

It is an amenable number.

31640888757668 is a deficient number, since it is larger than the sum of its proper divisors (24866362505116).

31640888757668 is a wasteful number, since it uses less digits than its factorization.

31640888757668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365772 (or 365770 counting only the distinct ones).

The product of its (nonzero) digits is 2601123840, while the sum is 77.

The spelling of 31640888757668 in words is "thirty-one trillion, six hundred forty billion, eight hundred eighty-eight million, seven hundred fifty-seven thousand, six hundred sixty-eight".