23158531865 has 32 divisors (see below), whose sum is σ = 32808222720. Its totient is φ = 15356894400.

The previous prime is 23158531831. The next prime is 23158531873. The reversal of 23158531865 is 56813585132.

It is a happy number.

It is not a de Polignac number, because 23158531865 - 2²² = 23154337561 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1684670 + ... + 1698360.

It is an arithmetic number, because the mean of its divisors is an integer number (1025256960).

Almost surely, 2^23158531865 is an apocalyptic number.

It is an amenable number.

23158531865 is a deficient number, since it is larger than the sum of its proper divisors (9649690855).

23158531865 is a wasteful number, since it uses less digits than its factorization.

23158531865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15293.

The product of its digits is 864000, while the sum is 47.

The spelling of 23158531865 in words is "twenty-three billion, one hundred fifty-eight million, five hundred thirty-one thousand, eight hundred sixty-five".