644235584143 has 2 divisors, whose sum is σ = 644235584144. Its totient is φ = 644235584142.

The previous prime is 644235584131. The next prime is 644235584207. The reversal of 644235584143 is 341485532446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644235584143 - 2⁹ = 644235583631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644235582143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322117792071 + 322117792072.

It is an arithmetic number, because the mean of its divisors is an integer number (322117792072).

Almost surely, 2^644235584143 is an apocalyptic number.

644235584143 is a deficient number, since it is larger than the sum of its proper divisors (1).

644235584143 is an equidigital number, since it uses as much as digits as its factorization.

644235584143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5529600, while the sum is 49.

The spelling of 644235584143 in words is "six hundred forty-four billion, two hundred thirty-five million, five hundred eighty-four thousand, one hundred forty-three".