6444168739 has 2 divisors, whose sum is σ = 6444168740. Its totient is φ = 6444168738.

The previous prime is 6444168737. The next prime is 6444168749. The reversal of 6444168739 is 9378614446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6444168739 - 2¹ = 6444168737 is a prime.

Together with 6444168737, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6444168737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222084369 + 3222084370.

It is an arithmetic number, because the mean of its divisors is an integer number (3222084370).

Almost surely, 2^6444168739 is an apocalyptic number.

6444168739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444168739 is an equidigital number, since it uses as much as digits as its factorization.

6444168739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 52.

The square root of 6444168739 is about 80275.5799667620. The cubic root of 6444168739 is about 1860.8968522411.

The spelling of 6444168739 in words is "six billion, four hundred forty-four million, one hundred sixty-eight thousand, seven hundred thirty-nine".