644184336113 has 2 divisors, whose sum is σ = 644184336114. Its totient is φ = 644184336112.

The previous prime is 644184336073. The next prime is 644184336119. The reversal of 644184336113 is 311633481446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 601691873344 + 42492462769 = 775688^2 + 206137^2 .

It is a cyclic number.

It is not a de Polignac number, because 644184336113 - 2⁶ = 644184336049 is a prime.

It is not a weakly prime, because it can be changed into another prime (644184336119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322092168056 + 322092168057.

It is an arithmetic number, because the mean of its divisors is an integer number (322092168057).

Almost surely, 2^644184336113 is an apocalyptic number.

It is an amenable number.

644184336113 is a deficient number, since it is larger than the sum of its proper divisors (1).

644184336113 is an equidigital number, since it uses as much as digits as its factorization.

644184336113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 44.

The spelling of 644184336113 in words is "six hundred forty-four billion, one hundred eighty-four million, three hundred thirty-six thousand, one hundred thirteen".