665930172013 has 2 divisors, whose sum is σ = 665930172014. Its totient is φ = 665930172012.

The previous prime is 665930171983. The next prime is 665930172059. The reversal of 665930172013 is 310271039566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659218957929 + 6711214084 = 811923^2 + 81922^2 .

It is a cyclic number.

It is not a de Polignac number, because 665930172013 - 2²⁹ = 665393301101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665930172073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332965086006 + 332965086007.

It is an arithmetic number, because the mean of its divisors is an integer number (332965086007).

Almost surely, 2^665930172013 is an apocalyptic number.

It is an amenable number.

665930172013 is a deficient number, since it is larger than the sum of its proper divisors (1).

665930172013 is an equidigital number, since it uses as much as digits as its factorization.

665930172013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 665930172013 in words is "six hundred sixty-five billion, nine hundred thirty million, one hundred seventy-two thousand, thirteen".