18872193186 has 128 divisors (see below), whose sum is σ = 52664371200. Its totient is φ = 4866454080.

The previous prime is 18872193173. The next prime is 18872193199. The reversal of 18872193186 is 68139127881.

It is an interprime number because it is at equal distance from previous prime (18872193173) and next prime (18872193199).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 561636 + ... + 594288.

It is an arithmetic number, because the mean of its divisors is an integer number (411440400).

Almost surely, 2^18872193186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18872193186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26332185600).

18872193186 is an abundant number, since it is smaller than the sum of its proper divisors (33792178014).

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

18872193186 is a wasteful number, since it uses less digits than its factorization.

18872193186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32821 (or 32815 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 18872193186 in words is "eighteen billion, eight hundred seventy-two million, one hundred ninety-three thousand, one hundred eighty-six".