665708602513 has 2 divisors, whose sum is σ = 665708602514. Its totient is φ = 665708602512.

The previous prime is 665708602487. The next prime is 665708602529. The reversal of 665708602513 is 315206807566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444152936704 + 221555665809 = 666448^2 + 470697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665708602513 is a prime.

It is a super-2 number, since 2×665708602513² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (665708602313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332854301256 + 332854301257.

It is an arithmetic number, because the mean of its divisors is an integer number (332854301257).

Almost surely, 2^665708602513 is an apocalyptic number.

It is an amenable number.

665708602513 is a deficient number, since it is larger than the sum of its proper divisors (1).

665708602513 is an equidigital number, since it uses as much as digits as its factorization.

665708602513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 665708602513 in words is "six hundred sixty-five billion, seven hundred eight million, six hundred two thousand, five hundred thirteen".