31506660513 has 12 divisors (see below), whose sum is σ = 46477911168. Its totient is φ = 20557537080.

The previous prime is 31506660511. The next prime is 31506660517.

31506660513 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31506660513 - 2¹ = 31506660511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31506660511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37241493 + ... + 37242338.

It is an arithmetic number, because the mean of its divisors is an integer number (3873159264).

Almost surely, 2^31506660513 is an apocalyptic number.

It is an amenable number.

31506660513 is a deficient number, since it is larger than the sum of its proper divisors (14971250655).

31506660513 is a wasteful number, since it uses less digits than its factorization.

31506660513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74483884 (or 74483881 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The spelling of 31506660513 in words is "thirty-one billion, five hundred six million, six hundred sixty thousand, five hundred thirteen".