5644646209 has 2 divisors, whose sum is σ = 5644646210. Its totient is φ = 5644646208.

The previous prime is 5644646201. The next prime is 5644646239. The reversal of 5644646209 is 9026464465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3032925184 + 2611721025 = 55072^2 + 51105^2 .

It is a cyclic number.

It is not a de Polignac number, because 5644646209 - 2³ = 5644646201 is a prime.

It is not a weakly prime, because it can be changed into another prime (5644646201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822323104 + 2822323105.

It is an arithmetic number, because the mean of its divisors is an integer number (2822323105).

Almost surely, 2^5644646209 is an apocalyptic number.

It is an amenable number.

5644646209 is a deficient number, since it is larger than the sum of its proper divisors (1).

5644646209 is an equidigital number, since it uses as much as digits as its factorization.

5644646209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The square root of 5644646209 is about 75130.8605634196. The cubic root of 5644646209 is about 1780.5147491837.

The spelling of 5644646209 in words is "five billion, six hundred forty-four million, six hundred forty-six thousand, two hundred nine".