664004219 has 2 divisors, whose sum is σ = 664004220. Its totient is φ = 664004218.

The previous prime is 664004189. The next prime is 664004249. The reversal of 664004219 is 912400466.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (664004189) and next prime (664004249).

It is a cyclic number.

It is not a de Polignac number, because 664004219 - 2²⁸ = 395568763 is a prime.

It is a super-2 number, since 2×664004219² = 881803205699599922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664004249) 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, 332002109 + 332002110.

It is an arithmetic number, because the mean of its divisors is an integer number (332002110).

Almost surely, 2^664004219 is an apocalyptic number.

664004219 is a deficient number, since it is larger than the sum of its proper divisors (1).

664004219 is an equidigital number, since it uses as much as digits as its factorization.

664004219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 664004219 is about 25768.2793177969. The cubic root of 664004219 is about 872.4159820357.

The spelling of 664004219 in words is "six hundred sixty-four million, four thousand, two hundred nineteen".