665930172017 has 16 divisors (see below), whose sum is σ = 727152691200. Its totient is φ = 604821848400.

The previous prime is 665930172013. The next prime is 665930172059. The reversal of 665930172017 is 710271039566.

It is a happy number.

It is not a de Polignac number, because 665930172017 - 2² = 665930172013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665930172013) 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, 72386984 + ... + 72396182.

It is an arithmetic number, because the mean of its divisors is an integer number (45447043200).

Almost surely, 2^665930172017 is an apocalyptic number.

It is an amenable number.

665930172017 is a deficient number, since it is larger than the sum of its proper divisors (61222519183).

665930172017 is a wasteful number, since it uses less digits than its factorization.

665930172017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14684.

The product of its (nonzero) digits is 476280, while the sum is 47.

The spelling of 665930172017 in words is "six hundred sixty-five billion, nine hundred thirty million, one hundred seventy-two thousand, seventeen".