666910698 has 16 divisors (see below), whose sum is σ = 1334784960. Its totient is φ = 222142976.

The previous prime is 666910661. The next prime is 666910711. The reversal of 666910698 is 896019666.

It is a self number, because there is not a number n which added to its sum of digits gives 666910698.

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, 30990 + ... + 47897.

It is an arithmetic number, because the mean of its divisors is an integer number (83424060).

Almost surely, 2^666910698 is an apocalyptic number.

666910698 is an abundant number, since it is smaller than the sum of its proper divisors (667874262).

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

666910698 is a wasteful number, since it uses less digits than its factorization.

666910698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80301.

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 666910698 is about 25824.6141887928. The cubic root of 666910698 is about 873.6870422360.

The spelling of 666910698 in words is "six hundred sixty-six million, nine hundred ten thousand, six hundred ninety-eight".