186640376904 has 80 divisors (see below), whose sum is σ = 523397975100. Its totient is φ = 62138233728.

The previous prime is 186640376899. The next prime is 186640376929. The reversal of 186640376904 is 409673046681.

186640376904 is a `hidden beast` number, since 1 + 86 + 6 + 403 + 76 + 90 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 186546248100 + 94128804 = 431910^2 + 9702^2 .

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 19 ways as a sum of consecutive naturals, for example, 363474 + ... + 710910.

Almost surely, 2^186640376904 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 186640376904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261698987550).

186640376904 is an abundant number, since it is smaller than the sum of its proper divisors (336757598196).

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

186640376904 is a wasteful number, since it uses less digits than its factorization.

186640376904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348284 (or 348271 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 186640376904 in words is "one hundred eighty-six billion, six hundred forty million, three hundred seventy-six thousand, nine hundred four".