18550552185 has 24 divisors (see below), whose sum is σ = 35077408704. Its totient is φ = 8994206880.

The previous prime is 18550552151. The next prime is 18550552261. The reversal of 18550552185 is 58125505581.

18550552185 is a `hidden beast` number, since 1 + 85 + 5 + 0 + 552 + 18 + 5 = 666.

It is not a de Polignac number, because 18550552185 - 2⁹ = 18550551673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18550552185.

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 23 ways as a sum of consecutive naturals, for example, 18737437 + ... + 18738426.

It is an arithmetic number, because the mean of its divisors is an integer number (1461558696).

Almost surely, 2^18550552185 is an apocalyptic number.

18550552185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18550552185 is a deficient number, since it is larger than the sum of its proper divisors (16526856519).

18550552185 is a wasteful number, since it uses less digits than its factorization.

18550552185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37475885 (or 37475882 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 45.

The spelling of 18550552185 in words is "eighteen billion, five hundred fifty million, five hundred fifty-two thousand, one hundred eighty-five".