666795198 has 16 divisors (see below), whose sum is σ = 1334825856. Its totient is φ = 222059160.

The previous prime is 666795187. The next prime is 666795203. The reversal of 666795198 is 891597666.

It is a happy number.

It is a Curzon number.

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, 44386 + ... + 57477.

It is an arithmetic number, because the mean of its divisors is an integer number (83426616).

Almost surely, 2^666795198 is an apocalyptic number.

666795198 is an abundant number, since it is smaller than the sum of its proper divisors (668030658).

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

666795198 is a wasteful number, since it uses less digits than its factorization.

666795198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102959.

The product of its digits is 4898880, while the sum is 57.

The square root of 666795198 is about 25822.3778533271. The cubic root of 666795198 is about 873.6366023597.

The spelling of 666795198 in words is "six hundred sixty-six million, seven hundred ninety-five thousand, one hundred ninety-eight".