665020506613 has 2 divisors, whose sum is σ = 665020506614. Its totient is φ = 665020506612.

The previous prime is 665020506599. The next prime is 665020506629. The reversal of 665020506613 is 316605020566.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664586909284 + 433597329 = 815222^2 + 20823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665020506613 is a prime.

It is a super-2 number, since 2×665020506613² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665020506113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332510253306 + 332510253307.

It is an arithmetic number, because the mean of its divisors is an integer number (332510253307).

Almost surely, 2^665020506613 is an apocalyptic number.

It is an amenable number.

665020506613 is a deficient number, since it is larger than the sum of its proper divisors (1).

665020506613 is an equidigital number, since it uses as much as digits as its factorization.

665020506613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 665020506613 in words is "six hundred sixty-five billion, twenty million, five hundred six thousand, six hundred thirteen".