31507530066 has 32 divisors (see below), whose sum is σ = 72431107200. Its totient is φ = 10140354000.

The previous prime is 31507530049. The next prime is 31507530077. The reversal of 31507530066 is 66003570513.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31507530066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10058310 + ... + 10061441.

It is an arithmetic number, because the mean of its divisors is an integer number (2263472100).

Almost surely, 2^31507530066 is an apocalyptic number.

31507530066 is an abundant number, since it is smaller than the sum of its proper divisors (40923577134).

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

31507530066 is a wasteful number, since it uses less digits than its factorization.

31507530066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20119791 (or 20119785 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The spelling of 31507530066 in words is "thirty-one billion, five hundred seven million, five hundred thirty thousand, sixty-six".