818664198 has 16 divisors (see below), whose sum is σ = 1786176576. Its totient is φ = 248080040.

The previous prime is 818664193. The next prime is 818664221. The reversal of 818664198 is 891466818.

It is a super-2 number, since 2×818664198² = 1340422138173966408, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 818664198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818664193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6201936 + ... + 6202067.

It is an arithmetic number, because the mean of its divisors is an integer number (111636036).

Almost surely, 2^818664198 is an apocalyptic number.

818664198 is an abundant number, since it is smaller than the sum of its proper divisors (967512378).

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

818664198 is a wasteful number, since it uses less digits than its factorization.

818664198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404019.

The product of its digits is 663552, while the sum is 51.

The square root of 818664198 is about 28612.3085052570. The cubic root of 818664198 is about 935.4816350504.

The spelling of 818664198 in words is "eight hundred eighteen million, six hundred sixty-four thousand, one hundred ninety-eight".