6664417 has 2 divisors, whose sum is σ = 6664418. Its totient is φ = 6664416.

The previous prime is 6664387. The next prime is 6664429. The reversal of 6664417 is 7144666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6507601 + 156816 = 2551^2 + 396^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664417 - 2¹⁹ = 6140129 is a prime.

6664417 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6664447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332208 + 3332209.

It is an arithmetic number, because the mean of its divisors is an integer number (3332209).

Almost surely, 2^6664417 is an apocalyptic number.

It is an amenable number.

6664417 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664417 is an equidigital number, since it uses as much as digits as its factorization.

6664417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 6664417 is about 2581.5532146365. The cubic root of 6664417 is about 188.1860332206.

Subtracting 6664417 from its reverse (7144666), we obtain a square (480249 = 693²).

The spelling of 6664417 in words is "six million, six hundred sixty-four thousand, four hundred seventeen".