6644752475309 has 4 divisors (see below), whose sum is σ = 7155887281116. Its totient is φ = 6133617669504.

The previous prime is 6644752475299. The next prime is 6644752475321. The reversal of 6644752475309 is 9035742574466.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 689029486084 + 5955722989225 = 830078^2 + 2440435^2 .

It is not a de Polignac number, because 6644752475309 - 2³⁶ = 6576032998573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644752475359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255567402884 + ... + 255567402909.

It is an arithmetic number, because the mean of its divisors is an integer number (1788971820279).

Almost surely, 2^{6644752475309} is an apocalyptic number.

It is an amenable number.

6644752475309 is a deficient number, since it is larger than the sum of its proper divisors (511134805807).

6644752475309 is a wasteful number, since it uses less digits than its factorization.

6644752475309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511134805806.

The product of its (nonzero) digits is 152409600, while the sum is 62.

The spelling of 6644752475309 in words is "six trillion, six hundred forty-four billion, seven hundred fifty-two million, four hundred seventy-five thousand, three hundred nine".