18506988136 has 32 divisors (see below), whose sum is σ = 42708435840. Its totient is φ = 7321445568.

The previous prime is 18506988131. The next prime is 18506988161. The reversal of 18506988136 is 63188960581.

It is not an unprimeable number, because it can be changed into a prime (18506988131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12710116 + ... + 12711571.

It is an arithmetic number, because the mean of its divisors is an integer number (1334638620).

Almost surely, 2^18506988136 is an apocalyptic number.

It is an amenable number.

18506988136 is an abundant number, since it is smaller than the sum of its proper divisors (24201447704).

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

18506988136 is a wasteful number, since it uses less digits than its factorization.

18506988136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25421713 (or 25421709 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 18506988136 in words is "eighteen billion, five hundred six million, nine hundred eighty-eight thousand, one hundred thirty-six".