648494317126657 has 2 divisors, whose sum is σ = 648494317126658. Its totient is φ = 648494317126656.

The previous prime is 648494317126631. The next prime is 648494317126697. The reversal of 648494317126657 is 756621713494846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 626767447784976 + 21726869341681 = 25035324^2 + 4661209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648494317126657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648494317126657.

It is not a weakly prime, because it can be changed into another prime (648494317126697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324247158563328 + 324247158563329.

It is an arithmetic number, because the mean of its divisors is an integer number (324247158563329).

Almost surely, 2^{648494317126657} is an apocalyptic number.

It is an amenable number.

648494317126657 is a deficient number, since it is larger than the sum of its proper divisors (1).

648494317126657 is an equidigital number, since it uses as much as digits as its factorization.

648494317126657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1463132160, while the sum is 73.

The spelling of 648494317126657 in words is "six hundred forty-eight trillion, four hundred ninety-four billion, three hundred seventeen million, one hundred twenty-six thousand, six hundred fifty-seven".