6444264689 has 2 divisors, whose sum is σ = 6444264690. Its totient is φ = 6444264688.

The previous prime is 6444264649. The next prime is 6444264691. The reversal of 6444264689 is 9864624446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5943176464 + 501088225 = 77092^2 + 22385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6444264689 is a prime.

Together with 6444264691, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6444264689.

It is not a weakly prime, because it can be changed into another prime (6444264649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222132344 + 3222132345.

It is an arithmetic number, because the mean of its divisors is an integer number (3222132345).

Almost surely, 2^6444264689 is an apocalyptic number.

It is an amenable number.

6444264689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444264689 is an equidigital number, since it uses as much as digits as its factorization.

6444264689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7962624, while the sum is 53.

The square root of 6444264689 is about 80276.1775933558. The cubic root of 6444264689 is about 1860.9060880931.

The spelling of 6444264689 in words is "six billion, four hundred forty-four million, two hundred sixty-four thousand, six hundred eighty-nine".