648806399993 has 2 divisors, whose sum is σ = 648806399994. Its totient is φ = 648806399992.

The previous prime is 648806399987. The next prime is 648806400023. The reversal of 648806399993 is 399993608846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543459416809 + 105346983184 = 737197^2 + 324572^2 .

It is a cyclic number.

It is not a de Polignac number, because 648806399993 - 2²⁰ = 648805351417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648806399993.

It is not a weakly prime, because it can be changed into another prime (648806399963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324403199996 + 324403199997.

It is an arithmetic number, because the mean of its divisors is an integer number (324403199997).

Almost surely, 2^648806399993 is an apocalyptic number.

It is an amenable number.

648806399993 is a deficient number, since it is larger than the sum of its proper divisors (1).

648806399993 is an equidigital number, since it uses as much as digits as its factorization.

648806399993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544195584, while the sum is 74.

The spelling of 648806399993 in words is "six hundred forty-eight billion, eight hundred six million, three hundred ninety-nine thousand, nine hundred ninety-three".