6444666247 has 2 divisors, whose sum is σ = 6444666248. Its totient is φ = 6444666246.

The previous prime is 6444666209. The next prime is 6444666313. The reversal of 6444666247 is 7426664446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6444666247 - 2¹⁹ = 6444141959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6444666247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6444666047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222333123 + 3222333124.

It is an arithmetic number, because the mean of its divisors is an integer number (3222333124).

Almost surely, 2^6444666247 is an apocalyptic number.

6444666247 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444666247 is an equidigital number, since it uses as much as digits as its factorization.

6444666247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 49.

The square root of 6444666247 is about 80278.6786575365. The cubic root of 6444666247 is about 1860.9447398370.

The spelling of 6444666247 in words is "six billion, four hundred forty-four million, six hundred sixty-six thousand, two hundred forty-seven".