31747872666 has 16 divisors (see below), whose sum is σ = 63780482304. Its totient is φ = 10535168064.

The previous prime is 31747872649. The next prime is 31747872677. The reversal of 31747872666 is 66627874713.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11862591 + ... + 11865266.

It is an arithmetic number, because the mean of its divisors is an integer number (3986280144).

Almost surely, 2^31747872666 is an apocalyptic number.

31747872666 is an abundant number, since it is smaller than the sum of its proper divisors (32032609638).

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

31747872666 is a wasteful number, since it uses less digits than its factorization.

31747872666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23728085.

The product of its digits is 14224896, while the sum is 57.

The spelling of 31747872666 in words is "thirty-one billion, seven hundred forty-seven million, eight hundred seventy-two thousand, six hundred sixty-six".