18550555500 has 48 divisors (see below), whose sum is σ = 54019221984. Its totient is φ = 4946814400.

The previous prime is 18550555489. The next prime is 18550555501. The reversal of 18550555500 is 555505581.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18550555501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6182019 + ... + 6185018.

It is an arithmetic number, because the mean of its divisors is an integer number (1125400458).

Almost surely, 2^18550555500 is an apocalyptic number.

18550555500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18550555500 is an abundant number, since it is smaller than the sum of its proper divisors (35468666484).

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

18550555500 is a wasteful number, since it uses less digits than its factorization.

18550555500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12367059 (or 12367047 counting only the distinct ones).

The product of its (nonzero) digits is 125000, while the sum is 39.

The spelling of 18550555500 in words is "eighteen billion, five hundred fifty million, five hundred fifty-five thousand, five hundred".