6643319 has 2 divisors, whose sum is σ = 6643320. Its totient is φ = 6643318.

The previous prime is 6643303. The next prime is 6643321. The reversal of 6643319 is 9133466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6643319 - 2⁴ = 6643303 is a prime.

It is a super-2 number, since 2×6643319² = 88267374671522, which contains 22 as substring.

Together with 6643321, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6643019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321659 + 3321660.

It is an arithmetic number, because the mean of its divisors is an integer number (3321660).

Almost surely, 2^6643319 is an apocalyptic number.

6643319 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643319 is an equidigital number, since it uses as much as digits as its factorization.

6643319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 32.

The square root of 6643319 is about 2577.4636757867. The cubic root of 6643319 is about 187.9872388350.

The spelling of 6643319 in words is "six million, six hundred forty-three thousand, three hundred nineteen".