666604617668 has 12 divisors (see below), whose sum is σ = 1272608815632. Its totient is φ = 303002098920.

The previous prime is 666604617607. The next prime is 666604617673. The reversal of 666604617668 is 866716406666.

It is a self number, because there is not a number n which added to its sum of digits gives 666604617668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7575052430 + ... + 7575052517.

It is an arithmetic number, because the mean of its divisors is an integer number (106050734636).

Almost surely, 2^666604617668 is an apocalyptic number.

It is an amenable number.

666604617668 is a deficient number, since it is larger than the sum of its proper divisors (606004197964).

666604617668 is a wasteful number, since it uses less digits than its factorization.

666604617668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15150104962 (or 15150104960 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 62.

The spelling of 666604617668 in words is "six hundred sixty-six billion, six hundred four million, six hundred seventeen thousand, six hundred sixty-eight".