644050063 has 2 divisors, whose sum is σ = 644050064. Its totient is φ = 644050062.

The previous prime is 644050061. The next prime is 644050073. The reversal of 644050063 is 360050446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644050063 - 2¹ = 644050061 is a prime.

Together with 644050061, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644050061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322025031 + 322025032.

It is an arithmetic number, because the mean of its divisors is an integer number (322025032).

Almost surely, 2^644050063 is an apocalyptic number.

644050063 is a deficient number, since it is larger than the sum of its proper divisors (1).

644050063 is an equidigital number, since it uses as much as digits as its factorization.

644050063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 644050063 is about 25378.1414410118. The cubic root of 644050063 is about 863.5878874337.

The spelling of 644050063 in words is "six hundred forty-four million, fifty thousand, sixty-three".