31661979585 has 16 divisors (see below), whose sum is σ = 50664337920. Its totient is φ = 16884665600.

The previous prime is 31661979581. The next prime is 31661979637. The reversal of 31661979585 is 58597916613.

It is not a de Polignac number, because 31661979585 - 2² = 31661979581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31661979581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51760 + ... + 256910.

It is an arithmetic number, because the mean of its divisors is an integer number (3166521120).

Almost surely, 2^31661979585 is an apocalyptic number.

It is an amenable number.

31661979585 is a deficient number, since it is larger than the sum of its proper divisors (19002358335).

31661979585 is a wasteful number, since it uses less digits than its factorization.

31661979585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215448.

The product of its digits is 12247200, while the sum is 60.

The spelling of 31661979585 in words is "thirty-one billion, six hundred sixty-one million, nine hundred seventy-nine thousand, five hundred eighty-five".