18487868556 has 24 divisors (see below), whose sum is σ = 45013941504. Its totient is φ = 5894682640.

The previous prime is 18487868527. The next prime is 18487868599. The reversal of 18487868556 is 65586878481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33492240 + ... + 33492791.

It is an arithmetic number, because the mean of its divisors is an integer number (1875580896).

Almost surely, 2^18487868556 is an apocalyptic number.

It is an amenable number.

18487868556 is an abundant number, since it is smaller than the sum of its proper divisors (26526072948).

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

18487868556 is a wasteful number, since it uses less digits than its factorization.

18487868556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66985061 (or 66985059 counting only the distinct ones).

The product of its digits is 103219200, while the sum is 66.

The spelling of 18487868556 in words is "eighteen billion, four hundred eighty-seven million, eight hundred sixty-eight thousand, five hundred fifty-six".