18564916520 has 32 divisors (see below), whose sum is σ = 42089937120. Its totient is φ = 7369277760.

The previous prime is 18564916441. The next prime is 18564916523. The reversal of 18564916520 is 2561946581.

It is a super-2 number, since 2×18564916520² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18564916523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1766222 + ... + 1776701.

It is an arithmetic number, because the mean of its divisors is an integer number (1315310535).

Almost surely, 2^18564916520 is an apocalyptic number.

18564916520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18564916520 is an abundant number, since it is smaller than the sum of its proper divisors (23525020600).

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

18564916520 is a wasteful number, since it uses less digits than its factorization.

18564916520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543065 (or 3543061 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 18564916520 in words is "eighteen billion, five hundred sixty-four million, nine hundred sixteen thousand, five hundred twenty".