18215112186 has 72 divisors (see below), whose sum is σ = 40381870620. Its totient is φ = 5933910528.

The previous prime is 18215112169. The next prime is 18215112197. The reversal of 18215112186 is 68121151281.

It can be written as a sum of positive squares in 6 ways, for example, as 10790015625 + 7425096561 = 103875^2 + 86169^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18215112186.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17038860 + ... + 17039928.

Almost surely, 2^18215112186 is an apocalyptic number.

18215112186 is an abundant number, since it is smaller than the sum of its proper divisors (22166758434).

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

18215112186 is a wasteful number, since it uses less digits than its factorization.

18215112186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520 (or 1464 counting only the distinct ones).

The product of its digits is 7680, while the sum is 36.

The spelling of 18215112186 in words is "eighteen billion, two hundred fifteen million, one hundred twelve thousand, one hundred eighty-six".