18520055558 has 16 divisors (see below), whose sum is σ = 27880014624. Its totient is φ = 9226768320.

The previous prime is 18520055549. The next prime is 18520055579. The reversal of 18520055558 is 85555002581.

It is a super-3 number, since 3×18520055558³ (a number of 32 digits) contains 333 as substring.

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, 755738 + ... + 779858.

It is an arithmetic number, because the mean of its divisors is an integer number (1742500914).

Almost surely, 2^18520055558 is an apocalyptic number.

18520055558 is a deficient number, since it is larger than the sum of its proper divisors (9359959066).

18520055558 is a wasteful number, since it uses less digits than its factorization.

18520055558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25487.

The product of its (nonzero) digits is 400000, while the sum is 44.

The spelling of 18520055558 in words is "eighteen billion, five hundred twenty million, fifty-five thousand, five hundred fifty-eight".