18589868136 has 144 divisors (see below), whose sum is σ = 58726324800. Its totient is φ = 5296995648.

The previous prime is 18589868117. The next prime is 18589868183. The reversal of 18589868136 is 63186898581.

18589868136 is a `hidden beast` number, since 18 + 589 + 8 + 6 + 8 + 1 + 36 = 666.

It is a super-2 number, since 2×18589868136² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 1330161 + ... + 1344063.

It is an arithmetic number, because the mean of its divisors is an integer number (407821700).

Almost surely, 2^18589868136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18589868136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29363162400).

18589868136 is an abundant number, since it is smaller than the sum of its proper divisors (40136456664).

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

18589868136 is a wasteful number, since it uses less digits than its factorization.

18589868136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14308 (or 14294 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 63.

The spelling of 18589868136 in words is "eighteen billion, five hundred eighty-nine million, eight hundred sixty-eight thousand, one hundred thirty-six".