18500000185 has 16 divisors (see below), whose sum is σ = 24141180816. Its totient is φ = 13552939008.

The previous prime is 18500000153. The next prime is 18500000201. The reversal of 18500000185 is 58100000581.

It can be written as a sum of positive squares in 8 ways, for example, as 3531211776 + 14968788409 = 59424^2 + 122347^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500000185 - 2⁵ = 18500000153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2938032 + ... + 2944321.

It is an arithmetic number, because the mean of its divisors is an integer number (1508823801).

Almost surely, 2^18500000185 is an apocalyptic number.

It is an amenable number.

18500000185 is a deficient number, since it is larger than the sum of its proper divisors (5641180631).

18500000185 is a wasteful number, since it uses less digits than its factorization.

18500000185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882412.

The product of its (nonzero) digits is 1600, while the sum is 28.

The spelling of 18500000185 in words is "eighteen billion, five hundred million, one hundred eighty-five", and thus it is an aban number.