665357753617 has 2 divisors, whose sum is σ = 665357753618. Its totient is φ = 665357753616.

The previous prime is 665357753549. The next prime is 665357753639. The reversal of 665357753617 is 716357753566.

665357753617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444303566721 + 221054186896 = 666561^2 + 470164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665357753617 is a prime.

It is not a weakly prime, because it can be changed into another prime (665357753677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332678876808 + 332678876809.

It is an arithmetic number, because the mean of its divisors is an integer number (332678876809).

Almost surely, 2^665357753617 is an apocalyptic number.

It is an amenable number.

665357753617 is a deficient number, since it is larger than the sum of its proper divisors (1).

665357753617 is an equidigital number, since it uses as much as digits as its factorization.

665357753617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83349000, while the sum is 61.

The spelling of 665357753617 in words is "six hundred sixty-five billion, three hundred fifty-seven million, seven hundred fifty-three thousand, six hundred seventeen".