665515013 has 2 divisors, whose sum is σ = 665515014. Its totient is φ = 665515012.

The previous prime is 665515009. The next prime is 665515043. The reversal of 665515013 is 310515566.

665515013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576816289 + 88698724 = 24017^2 + 9418^2 .

It is a cyclic number.

It is not a de Polignac number, because 665515013 - 2² = 665515009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665515003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332757506 + 332757507.

It is an arithmetic number, because the mean of its divisors is an integer number (332757507).

Almost surely, 2^665515013 is an apocalyptic number.

It is an amenable number.

665515013 is a deficient number, since it is larger than the sum of its proper divisors (1).

665515013 is an equidigital number, since it uses as much as digits as its factorization.

665515013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 665515013 is about 25797.5776576019. The cubic root of 665515013 is about 873.0771437265.

The spelling of 665515013 in words is "six hundred sixty-five million, five hundred fifteen thousand, thirteen".