664466399 has 2 divisors, whose sum is σ = 664466400. Its totient is φ = 664466398.

The previous prime is 664466359. The next prime is 664466417. The reversal of 664466399 is 993664466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664466399 - 2²⁴ = 647689183 is a prime.

It is a super-3 number, since 3×664466399³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664466399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664466359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332233199 + 332233200.

It is an arithmetic number, because the mean of its divisors is an integer number (332233200).

Almost surely, 2^664466399 is an apocalyptic number.

664466399 is a deficient number, since it is larger than the sum of its proper divisors (1).

664466399 is an equidigital number, since it uses as much as digits as its factorization.

664466399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 53.

The square root of 664466399 is about 25777.2457605540. The cubic root of 664466399 is about 872.6183500784.

The spelling of 664466399 in words is "six hundred sixty-four million, four hundred sixty-six thousand, three hundred ninety-nine".