31577672161 has 24 divisors (see below), whose sum is σ = 36905137920. Its totient is φ = 26940225312.

The previous prime is 31577672149. The next prime is 31577672171. The reversal of 31577672161 is 16127677513.

It is not a de Polignac number, because 31577672161 - 2⁵ = 31577672129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31577672111) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 10396135 + ... + 10399171.

It is an arithmetic number, because the mean of its divisors is an integer number (1537714080).

Almost surely, 2^31577672161 is an apocalyptic number.

It is an amenable number.

31577672161 is a deficient number, since it is larger than the sum of its proper divisors (5327465759).

31577672161 is a wasteful number, since it uses less digits than its factorization.

31577672161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973 (or 3966 counting only the distinct ones).

The product of its digits is 370440, while the sum is 46.

The spelling of 31577672161 in words is "thirty-one billion, five hundred seventy-seven million, six hundred seventy-two thousand, one hundred sixty-one".