665930172059 has 2 divisors, whose sum is σ = 665930172060. Its totient is φ = 665930172058.

The previous prime is 665930172013. The next prime is 665930172073. The reversal of 665930172059 is 950271039566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665930172059 - 2²⁸ = 665661736603 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665930172059.

It is not a weakly prime, because it can be changed into another prime (665930172959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332965086029 + 332965086030.

It is an arithmetic number, because the mean of its divisors is an integer number (332965086030).

Almost surely, 2^665930172059 is an apocalyptic number.

665930172059 is a deficient number, since it is larger than the sum of its proper divisors (1).

665930172059 is an equidigital number, since it uses as much as digits as its factorization.

665930172059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 53.

The spelling of 665930172059 in words is "six hundred sixty-five billion, nine hundred thirty million, one hundred seventy-two thousand, fifty-nine".