664466417 has 2 divisors, whose sum is σ = 664466418. Its totient is φ = 664466416.

The previous prime is 664466399. The next prime is 664466503. The reversal of 664466417 is 714664466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409617121 + 254849296 = 20239^2 + 15964^2 .

It is a cyclic number.

It is not a de Polignac number, because 664466417 - 2¹² = 664462321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664469417) 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 as a sum of consecutive naturals, namely, 332233208 + 332233209.

It is an arithmetic number, because the mean of its divisors is an integer number (332233209).

Almost surely, 2^664466417 is an apocalyptic number.

It is an amenable number.

664466417 is a deficient number, since it is larger than the sum of its proper divisors (1).

664466417 is an equidigital number, since it uses as much as digits as its factorization.

664466417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 44.

The square root of 664466417 is about 25777.2461096992. The cubic root of 664466417 is about 872.6183579580.

The spelling of 664466417 in words is "six hundred sixty-four million, four hundred sixty-six thousand, four hundred seventeen".