648458687257 has 2 divisors, whose sum is σ = 648458687258. Its totient is φ = 648458687256.

The previous prime is 648458687243. The next prime is 648458687273. The reversal of 648458687257 is 752786854846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391795876096 + 256662811161 = 625936^2 + 506619^2 .

It is a cyclic number.

It is not a de Polignac number, because 648458687257 - 2³⁵ = 614098948889 is a prime.

It is not a weakly prime, because it can be changed into another prime (648458681257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324229343628 + 324229343629.

It is an arithmetic number, because the mean of its divisors is an integer number (324229343629).

Almost surely, 2^648458687257 is an apocalyptic number.

It is an amenable number.

648458687257 is a deficient number, since it is larger than the sum of its proper divisors (1).

648458687257 is an equidigital number, since it uses as much as digits as its factorization.

648458687257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 722534400, while the sum is 70.

The spelling of 648458687257 in words is "six hundred forty-eight billion, four hundred fifty-eight million, six hundred eighty-seven thousand, two hundred fifty-seven".