18564836464 has 20 divisors (see below), whose sum is σ = 37862496040. Its totient is φ = 8793869760.

The previous prime is 18564836453. The next prime is 18564836473. The reversal of 18564836464 is 46463846581.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30533967 + ... + 30534574.

It is an arithmetic number, because the mean of its divisors is an integer number (1893124802).

Almost surely, 2^18564836464 is an apocalyptic number.

It is an amenable number.

18564836464 is an abundant number, since it is smaller than the sum of its proper divisors (19297659576).

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

18564836464 is a wasteful number, since it uses less digits than its factorization.

18564836464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61068568 (or 61068562 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 55.

The spelling of 18564836464 in words is "eighteen billion, five hundred sixty-four million, eight hundred thirty-six thousand, four hundred sixty-four".