646332385613 has 2 divisors, whose sum is σ = 646332385614. Its totient is φ = 646332385612.

The previous prime is 646332385591. The next prime is 646332385661. The reversal of 646332385613 is 316583233646.

646332385613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593981572804 + 52350812809 = 770702^2 + 228803^2 .

It is a cyclic number.

It is not a de Polignac number, because 646332385613 - 2⁶ = 646332385549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646332385213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323166192806 + 323166192807.

It is an arithmetic number, because the mean of its divisors is an integer number (323166192807).

Almost surely, 2^646332385613 is an apocalyptic number.

It is an amenable number.

646332385613 is a deficient number, since it is larger than the sum of its proper divisors (1).

646332385613 is an equidigital number, since it uses as much as digits as its factorization.

646332385613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 50.

The spelling of 646332385613 in words is "six hundred forty-six billion, three hundred thirty-two million, three hundred eighty-five thousand, six hundred thirteen".