23164865520 has 80 divisors (see below), whose sum is σ = 73562604192. Its totient is φ = 6026629120.

The previous prime is 23164865509. The next prime is 23164865557. The reversal of 23164865520 is 2556846132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×23164865520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1167237 + ... + 1186916.

Almost surely, 2^23164865520 is an apocalyptic number.

23164865520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23164865520 is an abundant number, since it is smaller than the sum of its proper divisors (50397738672).

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

23164865520 is a wasteful number, since it uses less digits than its factorization.

23164865520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354210 (or 2354204 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 23164865520 in words is "twenty-three billion, one hundred sixty-four million, eight hundred sixty-five thousand, five hundred twenty".