818161666 has 16 divisors (see below), whose sum is σ = 1405768320. Its totient is φ = 349839360.

The previous prime is 818161637. The next prime is 818161693. The reversal of 818161666 is 666161818.

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, 60415 + ... + 72706.

It is an arithmetic number, because the mean of its divisors is an integer number (87860520).

Almost surely, 2^818161666 is an apocalyptic number.

818161666 is a deficient number, since it is larger than the sum of its proper divisors (587606654).

818161666 is a wasteful number, since it uses less digits than its factorization.

818161666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133569.

The product of its digits is 82944, while the sum is 43.

The square root of 818161666 is about 28603.5254120886. The cubic root of 818161666 is about 935.2901826486.

The spelling of 818161666 in words is "eight hundred eighteen million, one hundred sixty-one thousand, six hundred sixty-six".