664284209 has 2 divisors, whose sum is σ = 664284210. Its totient is φ = 664284208.

The previous prime is 664284161. The next prime is 664284217. The reversal of 664284209 is 902482466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397125184 + 267159025 = 19928^2 + 16345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664284209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664280209) 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, 332142104 + 332142105.

It is an arithmetic number, because the mean of its divisors is an integer number (332142105).

Almost surely, 2^664284209 is an apocalyptic number.

It is an amenable number.

664284209 is a deficient number, since it is larger than the sum of its proper divisors (1).

664284209 is an equidigital number, since it uses as much as digits as its factorization.

664284209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 664284209 is about 25773.7115875847. The cubic root of 664284209 is about 872.5385883979.

The spelling of 664284209 in words is "six hundred sixty-four million, two hundred eighty-four thousand, two hundred nine".