666635333689 has 16 divisors (see below), whose sum is σ = 749752827264. Its totient is φ = 588110688000.

The previous prime is 666635333677. The next prime is 666635333713. The reversal of 666635333689 is 986333536666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 666635333689 - 2²⁵ = 666601779257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666635333689.

It is not an unprimeable number, because it can be changed into a prime (666635331689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569107 + ... + 1287304.

It is an arithmetic number, because the mean of its divisors is an integer number (46859551704).

Almost surely, 2^666635333689 is an apocalyptic number.

It is an amenable number.

666635333689 is a deficient number, since it is larger than the sum of its proper divisors (83117493575).

666635333689 is a wasteful number, since it uses less digits than its factorization.

666635333689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857648.

The product of its digits is 226748160, while the sum is 64.

The spelling of 666635333689 in words is "six hundred sixty-six billion, six hundred thirty-five million, three hundred thirty-three thousand, six hundred eighty-nine".