644752638083 has 2 divisors, whose sum is σ = 644752638084. Its totient is φ = 644752638082.

The previous prime is 644752638043. The next prime is 644752638227. The reversal of 644752638083 is 380836257446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644752638083 - 2¹⁶ = 644752572547 is a prime.

It is not a weakly prime, because it can be changed into another prime (644752638043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322376319041 + 322376319042.

It is an arithmetic number, because the mean of its divisors is an integer number (322376319042).

Almost surely, 2^644752638083 is an apocalyptic number.

644752638083 is a deficient number, since it is larger than the sum of its proper divisors (1).

644752638083 is an equidigital number, since it uses as much as digits as its factorization.

644752638083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23224320, while the sum is 56.

The spelling of 644752638083 in words is "six hundred forty-four billion, seven hundred fifty-two million, six hundred thirty-eight thousand, eighty-three".