866618180 has 24 divisors (see below), whose sum is σ = 1926951768. Its totient is φ = 326256128.

The previous prime is 866618171. The next prime is 866618213. The reversal of 866618180 is 81816668.

It is a happy number.

866618180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 54140164 + 812478016 = 7358^2 + 28504^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274099 + ... + 1274778.

It is an arithmetic number, because the mean of its divisors is an integer number (80289657).

Almost surely, 2^866618180 is an apocalyptic number.

It is an amenable number.

866618180 is an abundant number, since it is smaller than the sum of its proper divisors (1060333588).

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

866618180 is a wasteful number, since it uses less digits than its factorization.

866618180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548903 (or 2548901 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 866618180 is about 29438.3793711542. The cubic root of 866618180 is about 953.4017216114.

The spelling of 866618180 in words is "eight hundred sixty-six million, six hundred eighteen thousand, one hundred eighty".