641568359 has 2 divisors, whose sum is σ = 641568360. Its totient is φ = 641568358.

The previous prime is 641568353. The next prime is 641568373. The reversal of 641568359 is 953865146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641568359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641568353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320784179 + 320784180.

It is an arithmetic number, because the mean of its divisors is an integer number (320784180).

Almost surely, 2^641568359 is an apocalyptic number.

641568359 is a deficient number, since it is larger than the sum of its proper divisors (1).

641568359 is an equidigital number, since it uses as much as digits as its factorization.

641568359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The square root of 641568359 is about 25329.1997307455. The cubic root of 641568359 is about 862.4772449083.

The spelling of 641568359 in words is "six hundred forty-one million, five hundred sixty-eight thousand, three hundred fifty-nine".