31621425660 has 72 divisors (see below), whose sum is σ = 104638178736. Its totient is φ = 7665799680.

The previous prime is 31621425643. The next prime is 31621425673. The reversal of 31621425660 is 6652412613.

31621425660 is a `hidden beast` number, since 3 + 1 + 621 + 4 + 25 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7983229 + ... + 7987188.

It is an arithmetic number, because the mean of its divisors is an integer number (1453308038).

Almost surely, 2^31621425660 is an apocalyptic number.

31621425660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31621425660 is an abundant number, since it is smaller than the sum of its proper divisors (73016753076).

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

31621425660 is a wasteful number, since it uses less digits than its factorization.

31621425660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970443 (or 15970438 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 31621425660 in words is "thirty-one billion, six hundred twenty-one million, four hundred twenty-five thousand, six hundred sixty".