18538868502 has 48 divisors (see below), whose sum is σ = 50079025152. Its totient is φ = 4815290160.

The previous prime is 18538868489. The next prime is 18538868507. The reversal of 18538868502 is 20586883581.

It is a happy number.

18538868502 is a `hidden beast` number, since 1 + 8 + 53 + 8 + 86 + 8 + 502 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538868507) 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 23 ways as a sum of consecutive naturals, for example, 6686518 + ... + 6689289.

It is an arithmetic number, because the mean of its divisors is an integer number (1043313024).

Almost surely, 2^18538868502 is an apocalyptic number.

18538868502 is an abundant number, since it is smaller than the sum of its proper divisors (31540156650).

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

18538868502 is a wasteful number, since it uses less digits than its factorization.

18538868502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13375833 (or 13375830 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 54.

The spelling of 18538868502 in words is "eighteen billion, five hundred thirty-eight million, eight hundred sixty-eight thousand, five hundred two".