931661161665 has 64 divisors (see below), whose sum is σ = 1708562854656. Its totient is φ = 429446725632.

The previous prime is 931661161643. The next prime is 931661161681. The reversal of 931661161665 is 566161166139.

It is not a de Polignac number, because 931661161665 - 2⁷ = 931661161537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 88299 + ... + 1367888.

It is an arithmetic number, because the mean of its divisors is an integer number (26696294604).

Almost surely, 2^931661161665 is an apocalyptic number.

It is an amenable number.

931661161665 is a deficient number, since it is larger than the sum of its proper divisors (776901692991).

931661161665 is a wasteful number, since it uses less digits than its factorization.

931661161665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456418.

The product of its digits is 1049760, while the sum is 51.

The spelling of 931661161665 in words is "nine hundred thirty-one billion, six hundred sixty-one million, one hundred sixty-one thousand, six hundred sixty-five".