18520037185 has 16 divisors (see below), whose sum is σ = 23958418176. Its totient is φ = 13662145728.

The previous prime is 18520037183. The next prime is 18520037189. The reversal of 18520037185 is 58173002581.

It is a cyclic number.

It is not a de Polignac number, because 18520037185 - 2¹ = 18520037183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18520037183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84469 + ... + 210178.

It is an arithmetic number, because the mean of its divisors is an integer number (1497401136).

Almost surely, 2^18520037185 is an apocalyptic number.

It is an amenable number.

18520037185 is a deficient number, since it is larger than the sum of its proper divisors (5438380991).

18520037185 is a wasteful number, since it uses less digits than its factorization.

18520037185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295632.

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 18520037185 in words is "eighteen billion, five hundred twenty million, thirty-seven thousand, one hundred eighty-five".