664411219 has 2 divisors, whose sum is σ = 664411220. Its totient is φ = 664411218.

The previous prime is 664411217. The next prime is 664411249. The reversal of 664411219 is 912114466.

It is a happy number.

664411219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664411219 - 2¹ = 664411217 is a prime.

It is a super-2 number, since 2×664411219² = 882884535866131922, which contains 22 as substring.

Together with 664411217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (664411217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332205609 + 332205610.

It is an arithmetic number, because the mean of its divisors is an integer number (332205610).

Almost surely, 2^664411219 is an apocalyptic number.

664411219 is a deficient number, since it is larger than the sum of its proper divisors (1).

664411219 is an equidigital number, since it uses as much as digits as its factorization.

664411219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 664411219 is about 25776.1754145180. The cubic root of 664411219 is about 872.5941941474.

The spelling of 664411219 in words is "six hundred sixty-four million, four hundred eleven thousand, two hundred nineteen".