664443211 has 2 divisors, whose sum is σ = 664443212. Its totient is φ = 664443210.

The previous prime is 664443209. The next prime is 664443229. The reversal of 664443211 is 112344466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664443211 - 2¹ = 664443209 is a prime.

Together with 664443209, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (664440211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332221605 + 332221606.

It is an arithmetic number, because the mean of its divisors is an integer number (332221606).

Almost surely, 2^664443211 is an apocalyptic number.

664443211 is a deficient number, since it is larger than the sum of its proper divisors (1).

664443211 is an equidigital number, since it uses as much as digits as its factorization.

664443211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 664443211 is about 25776.7959801058. The cubic root of 664443211 is about 872.6081993220.

Adding to 664443211 its reverse (112344466), we get a palindrome (776787677).

The spelling of 664443211 in words is "six hundred sixty-four million, four hundred forty-three thousand, two hundred eleven".