644050533079 has 2 divisors, whose sum is σ = 644050533080. Its totient is φ = 644050533078.

The previous prime is 644050533053. The next prime is 644050533089. The reversal of 644050533079 is 970335050446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644050533079 - 2¹⁵ = 644050500311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644050533089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322025266539 + 322025266540.

It is an arithmetic number, because the mean of its divisors is an integer number (322025266540).

Almost surely, 2^644050533079 is an apocalyptic number.

644050533079 is a deficient number, since it is larger than the sum of its proper divisors (1).

644050533079 is an equidigital number, since it uses as much as digits as its factorization.

644050533079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 46.

The spelling of 644050533079 in words is "six hundred forty-four billion, fifty million, five hundred thirty-three thousand, seventy-nine".