664529219 has 2 divisors, whose sum is σ = 664529220. Its totient is φ = 664529218.

The previous prime is 664529209. The next prime is 664529221. The reversal of 664529219 is 912925466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664529219 - 2¹² = 664525123 is a prime.

It is a super-2 number, since 2×664529219² = 883198165809499922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 664529221, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664529219.

It is not a weakly prime, because it can be changed into another prime (664529209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332264609 + 332264610.

It is an arithmetic number, because the mean of its divisors is an integer number (332264610).

Almost surely, 2^664529219 is an apocalyptic number.

664529219 is a deficient number, since it is larger than the sum of its proper divisors (1).

664529219 is an equidigital number, since it uses as much as digits as its factorization.

664529219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 664529219 is about 25778.4642482829. The cubic root of 664529219 is about 872.6458489143.

The spelling of 664529219 in words is "six hundred sixty-four million, five hundred twenty-nine thousand, two hundred nineteen".