231504166161 has 6 divisors (see below), whose sum is σ = 334394906690. Its totient is φ = 154336110768.

The previous prime is 231504166147. The next prime is 231504166177. The reversal of 231504166161 is 161661405132.

231504166161 is a `hidden beast` number, since 2 + 31 + 5 + 0 + 4 + 1 + 6 + 616 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 222482965761 + 9021200400 = 471681^2 + 94980^2 .

It is not a de Polignac number, because 231504166161 - 2¹⁴ = 231504149777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231504166111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12861342556 + ... + 12861342573.

Almost surely, 2^231504166161 is an apocalyptic number.

It is an amenable number.

231504166161 is a deficient number, since it is larger than the sum of its proper divisors (102890740529).

231504166161 is a wasteful number, since it uses less digits than its factorization.

231504166161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25722685135 (or 25722685132 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 231504166161 in words is "two hundred thirty-one billion, five hundred four million, one hundred sixty-six thousand, one hundred sixty-one".