648243066689 has 2 divisors, whose sum is σ = 648243066690. Its totient is φ = 648243066688.

The previous prime is 648243066629. The next prime is 648243066719. The reversal of 648243066689 is 986660342846.

648243066689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543854626225 + 104388440464 = 737465^2 + 323092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648243066689 is a prime.

It is not a weakly prime, because it can be changed into another prime (648243066629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324121533344 + 324121533345.

It is an arithmetic number, because the mean of its divisors is an integer number (324121533345).

Almost surely, 2^648243066689 is an apocalyptic number.

It is an amenable number.

648243066689 is a deficient number, since it is larger than the sum of its proper divisors (1).

648243066689 is an equidigital number, since it uses as much as digits as its factorization.

648243066689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71663616, while the sum is 62.

The spelling of 648243066689 in words is "six hundred forty-eight billion, two hundred forty-three million, sixty-six thousand, six hundred eighty-nine".