646444202444641 has 2 divisors, whose sum is σ = 646444202444642. Its totient is φ = 646444202444640.

The previous prime is 646444202444633. The next prime is 646444202444687. The reversal of 646444202444641 is 146444202444646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621822798140625 + 24621404304016 = 24936375^2 + 4961996^2 .

It is a cyclic number.

It is not a de Polignac number, because 646444202444641 - 2³ = 646444202444633 is a prime.

It is not a weakly prime, because it can be changed into another prime (646444202444041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323222101222320 + 323222101222321.

It is an arithmetic number, because the mean of its divisors is an integer number (323222101222321).

Almost surely, 2^{646444202444641} is an apocalyptic number.

It is an amenable number.

646444202444641 is a deficient number, since it is larger than the sum of its proper divisors (1).

646444202444641 is an equidigital number, since it uses as much as digits as its factorization.

646444202444641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56623104, while the sum is 55.

The spelling of 646444202444641 in words is "six hundred forty-six trillion, four hundred forty-four billion, two hundred two million, four hundred forty-four thousand, six hundred forty-one".