6444644363 has 4 divisors (see below), whose sum is σ = 6501676728. Its totient is φ = 6387612000.

The previous prime is 6444644357. The next prime is 6444644417. The reversal of 6444644363 is 3634464446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6444644363 - 2¹⁶ = 6444578827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6444643363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28516013 + ... + 28516238.

It is an arithmetic number, because the mean of its divisors is an integer number (1625419182).

Almost surely, 2^6444644363 is an apocalyptic number.

6444644363 is a deficient number, since it is larger than the sum of its proper divisors (57032365).

6444644363 is a wasteful number, since it uses less digits than its factorization.

6444644363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57032364.

The product of its digits is 1990656, while the sum is 44.

The square root of 6444644363 is about 80278.5423572202. The cubic root of 6444644363 is about 1860.9426334460.

The spelling of 6444644363 in words is "six billion, four hundred forty-four million, six hundred forty-four thousand, three hundred sixty-three".