648642365717 has 2 divisors, whose sum is σ = 648642365718. Its totient is φ = 648642365716.

The previous prime is 648642365687. The next prime is 648642365719. The reversal of 648642365717 is 717563246846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636060481156 + 12581884561 = 797534^2 + 112169^2 .

It is a cyclic number.

It is not a de Polignac number, because 648642365717 - 2¹² = 648642361621 is a prime.

Together with 648642365719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648642365719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324321182858 + 324321182859.

It is an arithmetic number, because the mean of its divisors is an integer number (324321182859).

Almost surely, 2^648642365717 is an apocalyptic number.

It is an amenable number.

648642365717 is a deficient number, since it is larger than the sum of its proper divisors (1).

648642365717 is an equidigital number, since it uses as much as digits as its factorization.

648642365717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 59.

The spelling of 648642365717 in words is "six hundred forty-eight billion, six hundred forty-two million, three hundred sixty-five thousand, seven hundred seventeen".