6444205409 has 2 divisors, whose sum is σ = 6444205410. Its totient is φ = 6444205408.

The previous prime is 6444205337. The next prime is 6444205421. The reversal of 6444205409 is 9045024446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3574246225 + 2869959184 = 59785^2 + 53572^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444205409 - 2⁸ = 6444205153 is a prime.

It is not a weakly prime, because it can be changed into another prime (6444202409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222102704 + 3222102705.

It is an arithmetic number, because the mean of its divisors is an integer number (3222102705).

Almost surely, 2^6444205409 is an apocalyptic number.

It is an amenable number.

6444205409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444205409 is an equidigital number, since it uses as much as digits as its factorization.

6444205409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 6444205409 is about 80275.8083671538. The cubic root of 6444205409 is about 1860.9003819933.

The spelling of 6444205409 in words is "six billion, four hundred forty-four million, two hundred five thousand, four hundred nine".