18555565557012 has 24 divisors (see below), whose sum is σ = 47232348690912. Its totient is φ = 5622898653600.

The previous prime is 18555565556971. The next prime is 18555565557043. The reversal of 18555565557012 is 21075556555581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70286233039 + ... + 70286233302.

It is an arithmetic number, because the mean of its divisors is an integer number (1968014528788).

Almost surely, 2^{18555565557012} is an apocalyptic number.

18555565557012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18555565557012 is an abundant number, since it is smaller than the sum of its proper divisors (28676783133900).

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

18555565557012 is a wasteful number, since it uses less digits than its factorization.

18555565557012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140572466359 (or 140572466357 counting only the distinct ones).

The product of its (nonzero) digits is 52500000, while the sum is 60.

The spelling of 18555565557012 in words is "eighteen trillion, five hundred fifty-five billion, five hundred sixty-five million, five hundred fifty-seven thousand, twelve".