31021938580656 has 160 divisors (see below), whose sum is σ = 81013358027520. Its totient is φ = 10228557893632.

The previous prime is 31021938580649. The next prime is 31021938580673. The reversal of 31021938580656 is 65608583912013.

It is a junction number, because it is equal to n+sod(n) for n = 31021938580596 and 31021938580605.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2356746331 + ... + 2356759493.

It is an arithmetic number, because the mean of its divisors is an integer number (506333487672).

Almost surely, 2^{31021938580656} is an apocalyptic number.

It is an amenable number.

31021938580656 is an abundant number, since it is smaller than the sum of its proper divisors (49991419446864).

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

31021938580656 is a wasteful number, since it uses less digits than its factorization.

31021938580656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14563 (or 14557 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 57.

The spelling of 31021938580656 in words is "thirty-one trillion, twenty-one billion, nine hundred thirty-eight million, five hundred eighty thousand, six hundred fifty-six".