6444168749 has 2 divisors, whose sum is σ = 6444168750. Its totient is φ = 6444168748.

The previous prime is 6444168739. The next prime is 6444168769. The reversal of 6444168749 is 9478614446.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6429153124 + 15015625 = 80182^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444168749 - 2²⁴ = 6427391533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6444168749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6444168739) 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, 3222084374 + 3222084375.

It is an arithmetic number, because the mean of its divisors is an integer number (3222084375).

Almost surely, 2^6444168749 is an apocalyptic number.

It is an amenable number.

6444168749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444168749 is an equidigital number, since it uses as much as digits as its factorization.

6444168749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 53.

The square root of 6444168749 is about 80275.5800290474. The cubic root of 6444168749 is about 1860.8968532036.

The spelling of 6444168749 in words is "six billion, four hundred forty-four million, one hundred sixty-eight thousand, seven hundred forty-nine".