23506172865 has 120 divisors (see below), whose sum is σ = 49879452480. Its totient is φ = 10374086016.

The previous prime is 23506172843. The next prime is 23506172909. The reversal of 23506172865 is 56827160532.

23506172865 is a `hidden beast` number, since 2 + 3 + 5 + 0 + 617 + 28 + 6 + 5 = 666.

It is not a de Polignac number, because 23506172865 - 2²⁰ = 23505124289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 23506172865.

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 119 ways as a sum of consecutive naturals, for example, 2379306 + ... + 2389164.

It is an arithmetic number, because the mean of its divisors is an integer number (415662104).

Almost surely, 2^23506172865 is an apocalyptic number.

It is an amenable number.

23506172865 is an abundant number, since it is smaller than the sum of its proper divisors (26373279615).

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

23506172865 is an equidigital number, since it uses as much as digits as its factorization.

23506172865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9941 (or 9903 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 23506172865 in words is "twenty-three billion, five hundred six million, one hundred seventy-two thousand, eight hundred sixty-five".