18204572808 has 48 divisors (see below), whose sum is σ = 52204293180. Its totient is φ = 5711238144.

The previous prime is 18204572807. The next prime is 18204572819. The reversal of 18204572808 is 80827540281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18165109284 + 39463524 = 134778^2 + 6282^2 .

It is a super-2 number, since 2×18204572808² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18204572807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7435285 + ... + 7437732.

Almost surely, 2^18204572808 is an apocalyptic number.

18204572808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18204572808 is an abundant number, since it is smaller than the sum of its proper divisors (33999720372).

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

18204572808 is a wasteful number, since it uses less digits than its factorization.

18204572808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14873046 (or 14873039 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 18204572808 in words is "eighteen billion, two hundred four million, five hundred seventy-two thousand, eight hundred eight".