31909642666 has 16 divisors (see below), whose sum is σ = 52300981728. Its totient is φ = 14480715600.

The previous prime is 31909642657. The next prime is 31909642691. The reversal of 31909642666 is 66624690913.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169580 + ... + 1196551.

It is an arithmetic number, because the mean of its divisors is an integer number (3268811358).

Almost surely, 2^31909642666 is an apocalyptic number.

31909642666 is a deficient number, since it is larger than the sum of its proper divisors (20391339062).

31909642666 is a wasteful number, since it uses less digits than its factorization.

31909642666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366757.

The product of its (nonzero) digits is 2519424, while the sum is 52.

The spelling of 31909642666 in words is "thirty-one billion, nine hundred nine million, six hundred forty-two thousand, six hundred sixty-six".