6443752009 has 2 divisors, whose sum is σ = 6443752010. Its totient is φ = 6443752008.

The previous prime is 6443751991. The next prime is 6443752037. The reversal of 6443752009 is 9002573446.

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., 6420015625 + 23736384 = 80125^2 + 4872^2 .

It is a cyclic number.

It is not a de Polignac number, because 6443752009 - 2²³ = 6435363401 is a prime.

It is not a weakly prime, because it can be changed into another prime (6443752309) 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, 3221876004 + 3221876005.

It is an arithmetic number, because the mean of its divisors is an integer number (3221876005).

Almost surely, 2^6443752009 is an apocalyptic number.

It is an amenable number.

6443752009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6443752009 is an equidigital number, since it uses as much as digits as its factorization.

6443752009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 6443752009 is about 80272.9843035626. The cubic root of 6443752009 is about 1860.8567380286.

The spelling of 6443752009 in words is "six billion, four hundred forty-three million, seven hundred fifty-two thousand, nine".