18808965864 has 72 divisors (see below), whose sum is σ = 55160945190. Its totient is φ = 5787370368.

The previous prime is 18808965853. The next prime is 18808965871. The reversal of 18808965864 is 46856980881.

It can be written as a sum of positive squares in 3 ways, for example, as 6478640100 + 12330325764 = 80490^2 + 111042^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 760719 + ... + 785054.

Almost surely, 2^18808965864 is an apocalyptic number.

It is an amenable number.

18808965864 is an abundant number, since it is smaller than the sum of its proper divisors (36351979326).

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

18808965864 is a wasteful number, since it uses less digits than its factorization.

18808965864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545811 (or 1545791 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 18808965864 in words is "eighteen billion, eight hundred eight million, nine hundred sixty-five thousand, eight hundred sixty-four".