666800008 has 32 divisors (see below), whose sum is σ = 1432301760. Its totient is φ = 285082560.

The previous prime is 666799963. The next prime is 666800023. The reversal of 666800008 is 800008666.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9435 + ... + 37717.

It is an arithmetic number, because the mean of its divisors is an integer number (44759430).

Almost surely, 2^666800008 is an apocalyptic number.

It is an amenable number.

666800008 is an abundant number, since it is smaller than the sum of its proper divisors (765501752).

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

666800008 is a wasteful number, since it uses less digits than its factorization.

666800008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28717 (or 28713 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 666800008 is about 25822.4709894309. The cubic root of 666800008 is about 873.6387030457.

The spelling of 666800008 in words is "six hundred sixty-six million, eight hundred thousand, eight".