641644446143 has 2 divisors, whose sum is σ = 641644446144. Its totient is φ = 641644446142.

The previous prime is 641644446139. The next prime is 641644446187. The reversal of 641644446143 is 341644446146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641644446143 - 2² = 641644446139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641644449143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320822223071 + 320822223072.

It is an arithmetic number, because the mean of its divisors is an integer number (320822223072).

Almost surely, 2^641644446143 is an apocalyptic number.

641644446143 is a deficient number, since it is larger than the sum of its proper divisors (1).

641644446143 is an equidigital number, since it uses as much as digits as its factorization.

641644446143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 47.

The spelling of 641644446143 in words is "six hundred forty-one billion, six hundred forty-four million, four hundred forty-six thousand, one hundred forty-three".