665307017 has 2 divisors, whose sum is σ = 665307018. Its totient is φ = 665307016.

The previous prime is 665306989. The next prime is 665307029. The reversal of 665307017 is 710703566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406869241 + 258437776 = 20171^2 + 16076^2 .

It is a cyclic number.

It is not a de Polignac number, because 665307017 - 2²⁸ = 396871561 is a prime.

It is not a weakly prime, because it can be changed into another prime (665307037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332653508 + 332653509.

It is an arithmetic number, because the mean of its divisors is an integer number (332653509).

Almost surely, 2^665307017 is an apocalyptic number.

It is an amenable number.

665307017 is a deficient number, since it is larger than the sum of its proper divisors (1).

665307017 is an equidigital number, since it uses as much as digits as its factorization.

665307017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 665307017 is about 25793.5460338434. The cubic root of 665307017 is about 872.9861788489.

The spelling of 665307017 in words is "six hundred sixty-five million, three hundred seven thousand, seventeen".