166866870186 has 12 divisors (see below), whose sum is σ = 361544885442. Its totient is φ = 55622290056.

The previous prime is 166866870161. The next prime is 166866870187. The reversal of 166866870186 is 681078668661.

It can be written as a sum of positive squares in only one way, i.e., 162504928161 + 4361942025 = 403119^2 + 66045^2 .

It is not an unprimeable number, because it can be changed into a prime (166866870187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4635190821 + ... + 4635190856.

Almost surely, 2^166866870186 is an apocalyptic number.

166866870186 is an abundant number, since it is smaller than the sum of its proper divisors (194678015256).

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

166866870186 is a wasteful number, since it uses less digits than its factorization.

166866870186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270381685 (or 9270381682 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 166866870186 in words is "one hundred sixty-six billion, eight hundred sixty-six million, eight hundred seventy thousand, one hundred eighty-six".