644374942301 has 2 divisors, whose sum is σ = 644374942302. Its totient is φ = 644374942300.

The previous prime is 644374942279. The next prime is 644374942339. The reversal of 644374942301 is 103249473446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377178994201 + 267195948100 = 614149^2 + 516910^2 .

It is a cyclic number.

It is not a de Polignac number, because 644374942301 - 2¹⁰ = 644374941277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644374942381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322187471150 + 322187471151.

It is an arithmetic number, because the mean of its divisors is an integer number (322187471151).

Almost surely, 2^644374942301 is an apocalyptic number.

It is an amenable number.

644374942301 is a deficient number, since it is larger than the sum of its proper divisors (1).

644374942301 is an equidigital number, since it uses as much as digits as its factorization.

644374942301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 47.

The spelling of 644374942301 in words is "six hundred forty-four billion, three hundred seventy-four million, nine hundred forty-two thousand, three hundred one".