648642365759 has 4 divisors (see below), whose sum is σ = 660880901016. Its totient is φ = 636403830504.

The previous prime is 648642365729. The next prime is 648642365779. The reversal of 648642365759 is 957563246846.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648642365759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648642365695 and 648642365704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648642365719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6119267549 + ... + 6119267654.

It is an arithmetic number, because the mean of its divisors is an integer number (165220225254).

Almost surely, 2^648642365759 is an apocalyptic number.

648642365759 is a deficient number, since it is larger than the sum of its proper divisors (12238535257).

648642365759 is a wasteful number, since it uses less digits than its factorization.

648642365759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12238535256.

The product of its digits is 261273600, while the sum is 65.

The spelling of 648642365759 in words is "six hundred forty-eight billion, six hundred forty-two million, three hundred sixty-five thousand, seven hundred fifty-nine".