666604617713 has 4 divisors (see below), whose sum is σ = 669541202160. Its totient is φ = 663668033268.

The previous prime is 666604617673. The next prime is 666604617727. The reversal of 666604617713 is 317716406666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666604617713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666604617313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468291883 + ... + 1468292336.

It is an arithmetic number, because the mean of its divisors is an integer number (167385300540).

Almost surely, 2^666604617713 is an apocalyptic number.

It is an amenable number.

666604617713 is a deficient number, since it is larger than the sum of its proper divisors (2936584447).

666604617713 is a wasteful number, since it uses less digits than its factorization.

666604617713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936584446.

The product of its (nonzero) digits is 4572288, while the sum is 53.

The spelling of 666604617713 in words is "six hundred sixty-six billion, six hundred four million, six hundred seventeen thousand, seven hundred thirteen".