6444744043647 has 32 divisors (see below), whose sum is σ = 10694821616640. Its totient is φ = 3361229625600.

The previous prime is 6444744043643. The next prime is 6444744043649. The reversal of 6444744043647 is 7463404474446.

It is a happy number.

It is not a de Polignac number, because 6444744043647 - 2² = 6444744043643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444744043643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132599979 + ... + 132648572.

It is an arithmetic number, because the mean of its divisors is an integer number (334213175520).

Almost surely, 2^{6444744043647} is an apocalyptic number.

6444744043647 is a deficient number, since it is larger than the sum of its proper divisors (4250077572993).

6444744043647 is a wasteful number, since it uses less digits than its factorization.

6444744043647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265248663.

The product of its (nonzero) digits is 86704128, while the sum is 57.

The spelling of 6444744043647 in words is "six trillion, four hundred forty-four billion, seven hundred forty-four million, forty-three thousand, six hundred forty-seven".