648642365779 has 2 divisors, whose sum is σ = 648642365780. Its totient is φ = 648642365778.

The previous prime is 648642365729. The next prime is 648642365863. The reversal of 648642365779 is 977563246846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648642365779 - 2¹⁵ = 648642333011 is a prime.

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, 324321182889 + 324321182890.

It is an arithmetic number, because the mean of its divisors is an integer number (324321182890).

Almost surely, 2^648642365779 is an apocalyptic number.

648642365779 is a deficient number, since it is larger than the sum of its proper divisors (1).

648642365779 is an equidigital number, since it uses as much as digits as its factorization.

648642365779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 365783040, while the sum is 67.

The spelling of 648642365779 in words is "six hundred forty-eight billion, six hundred forty-two million, three hundred sixty-five thousand, seven hundred seventy-nine".