31975456656 has 160 divisors (see below), whose sum is σ = 97305772032. Its totient is φ = 8920097280.

The previous prime is 31975456627. The next prime is 31975456657. The reversal of 31975456656 is 65665457913.

It is a junction number, because it is equal to n+sod(n) for n = 31975456596 and 31975456605.

It is not an unprimeable number, because it can be changed into a prime (31975456657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2622831 + ... + 2634993.

Almost surely, 2^31975456656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31975456656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48652886016).

31975456656 is an abundant number, since it is smaller than the sum of its proper divisors (65330315376).

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

31975456656 is a wasteful number, since it uses less digits than its factorization.

31975456656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12581 (or 12575 counting only the distinct ones).

The product of its digits is 20412000, while the sum is 57.

The spelling of 31975456656 in words is "thirty-one billion, nine hundred seventy-five million, four hundred fifty-six thousand, six hundred fifty-six".