665357605613 has 2 divisors, whose sum is σ = 665357605614. Its totient is φ = 665357605612.

The previous prime is 665357605547. The next prime is 665357605643. The reversal of 665357605613 is 316506753566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501848978569 + 163508627044 = 708413^2 + 404362^2 .

It is a cyclic number.

It is not a de Polignac number, because 665357605613 - 2¹⁰ = 665357604589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665357605643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332678802806 + 332678802807.

It is an arithmetic number, because the mean of its divisors is an integer number (332678802807).

Almost surely, 2^665357605613 is an apocalyptic number.

It is an amenable number.

665357605613 is a deficient number, since it is larger than the sum of its proper divisors (1).

665357605613 is an equidigital number, since it uses as much as digits as its factorization.

665357605613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206000, while the sum is 53.

The spelling of 665357605613 in words is "six hundred sixty-five billion, three hundred fifty-seven million, six hundred five thousand, six hundred thirteen".