31531648557696 has 128 divisors (see below), whose sum is σ = 95727529714560. Its totient is φ = 9008435036160.

The previous prime is 31531648557691. The next prime is 31531648557803. The reversal of 31531648557696 is 69675584613513.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 31531648557696.

It is not an unprimeable number, because it can be changed into a prime (31531648557691) 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, 40257360 + ... + 41033136.

It is an arithmetic number, because the mean of its divisors is an integer number (747871325895).

Almost surely, 2^{31531648557696} is an apocalyptic number.

It is an amenable number.

31531648557696 is an abundant number, since it is smaller than the sum of its proper divisors (64195881156864).

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

31531648557696 is a wasteful number, since it uses less digits than its factorization.

31531648557696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790922 (or 790910 counting only the distinct ones).

The product of its digits is 489888000, while the sum is 69.

The spelling of 31531648557696 in words is "thirty-one trillion, five hundred thirty-one billion, six hundred forty-eight million, five hundred fifty-seven thousand, six hundred ninety-six".