664403219 has 2 divisors, whose sum is σ = 664403220. Its totient is φ = 664403218.

The previous prime is 664403183. The next prime is 664403227. The reversal of 664403219 is 912304466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664403219 - 2¹² = 664399123 is a prime.

It is a super-2 number, since 2×664403219² = 882863274835123922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664403239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332201609 + 332201610.

It is an arithmetic number, because the mean of its divisors is an integer number (332201610).

Almost surely, 2^664403219 is an apocalyptic number.

664403219 is a deficient number, since it is larger than the sum of its proper divisors (1).

664403219 is an equidigital number, since it uses as much as digits as its factorization.

664403219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 664403219 is about 25776.0202319908. The cubic root of 664403219 is about 872.5906919080.

The spelling of 664403219 in words is "six hundred sixty-four million, four hundred three thousand, two hundred nineteen".