644269303 has 2 divisors, whose sum is σ = 644269304. Its totient is φ = 644269302.

The previous prime is 644269289. The next prime is 644269313. The reversal of 644269303 is 303962446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644269303 - 2⁹ = 644268791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644269313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322134651 + 322134652.

It is an arithmetic number, because the mean of its divisors is an integer number (322134652).

Almost surely, 2^644269303 is an apocalyptic number.

644269303 is a deficient number, since it is larger than the sum of its proper divisors (1).

644269303 is an equidigital number, since it uses as much as digits as its factorization.

644269303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 644269303 is about 25382.4605387263. The cubic root of 644269303 is about 863.6858671508.

The spelling of 644269303 in words is "six hundred forty-four million, two hundred sixty-nine thousand, three hundred three".