644201113429 has 2 divisors, whose sum is σ = 644201113430. Its totient is φ = 644201113428.

The previous prime is 644201113331. The next prime is 644201113441. The reversal of 644201113429 is 924311102446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474172714404 + 170028399025 = 688602^2 + 412345^2 .

It is a cyclic number.

It is not a de Polignac number, because 644201113429 - 2²⁵ = 644167558997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644261113429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322100556714 + 322100556715.

It is an arithmetic number, because the mean of its divisors is an integer number (322100556715).

Almost surely, 2^644201113429 is an apocalyptic number.

It is an amenable number.

644201113429 is a deficient number, since it is larger than the sum of its proper divisors (1).

644201113429 is an equidigital number, since it uses as much as digits as its factorization.

644201113429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 644201113429 in words is "six hundred forty-four billion, two hundred one million, one hundred thirteen thousand, four hundred twenty-nine".