31666516506 has 48 divisors (see below), whose sum is σ = 68899365600. Its totient is φ = 10511200224.

The previous prime is 31666516487. The next prime is 31666516507. The reversal of 31666516506 is 60561566613.

It is not an unprimeable number, because it can be changed into a prime (31666516507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4833525 + ... + 4840071.

It is an arithmetic number, because the mean of its divisors is an integer number (1435403450).

Almost surely, 2^31666516506 is an apocalyptic number.

31666516506 is an abundant number, since it is smaller than the sum of its proper divisors (37232849094).

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

31666516506 is a wasteful number, since it uses less digits than its factorization.

31666516506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7643 (or 7640 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 31666516506 in words is "thirty-one billion, six hundred sixty-six million, five hundred sixteen thousand, five hundred six".