6664309 has 2 divisors, whose sum is σ = 6664310. Its totient is φ = 6664308.

The previous prime is 6664279. The next prime is 6664321. The reversal of 6664309 is 9034666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6646084 + 18225 = 2578^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664309 - 2⁵ = 6664277 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6662309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332154 + 3332155.

It is an arithmetic number, because the mean of its divisors is an integer number (3332155).

Almost surely, 2^6664309 is an apocalyptic number.

It is an amenable number.

6664309 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664309 is an equidigital number, since it uses as much as digits as its factorization.

6664309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 6664309 is about 2581.5322969120. The cubic root of 6664309 is about 188.1850166675.

The spelling of 6664309 in words is "six million, six hundred sixty-four thousand, three hundred nine".