666584198 has 16 divisors (see below), whose sum is σ = 1182120480. Its totient is φ = 275827776.

The previous prime is 666584179. The next prime is 666584207. The reversal of 666584198 is 891485666.

666584198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 820511 + ... + 821322.

It is an arithmetic number, because the mean of its divisors is an integer number (73882530).

Almost surely, 2^666584198 is an apocalyptic number.

666584198 is a deficient number, since it is larger than the sum of its proper divisors (515536282).

666584198 is a wasteful number, since it uses less digits than its factorization.

666584198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641871.

The product of its digits is 2488320, while the sum is 53.

The square root of 666584198 is about 25818.2919264618. The cubic root of 666584198 is about 873.5444417428.

The spelling of 666584198 in words is "six hundred sixty-six million, five hundred eighty-four thousand, one hundred ninety-eight".