646020455959 has 2 divisors, whose sum is σ = 646020455960. Its totient is φ = 646020455958.

The previous prime is 646020455917. The next prime is 646020456031. The reversal of 646020455959 is 959554020646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646020455959 - 2¹⁹ = 646019931671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646020455159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323010227979 + 323010227980.

It is an arithmetic number, because the mean of its divisors is an integer number (323010227980).

Almost surely, 2^646020455959 is an apocalyptic number.

646020455959 is a deficient number, since it is larger than the sum of its proper divisors (1).

646020455959 is an equidigital number, since it uses as much as digits as its factorization.

646020455959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664000, while the sum is 55.

The spelling of 646020455959 in words is "six hundred forty-six billion, twenty million, four hundred fifty-five thousand, nine hundred fifty-nine".