6643223 has 8 divisors (see below), whose sum is σ = 6824400. Its totient is φ = 6464448.

The previous prime is 6643213. The next prime is 6643229. The reversal of 6643223 is 3223466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6643223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6643192 and 6643201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5915 + ... + 6947.

It is an arithmetic number, because the mean of its divisors is an integer number (853050).

Almost surely, 2^6643223 is an apocalyptic number.

6643223 is a deficient number, since it is larger than the sum of its proper divisors (181177).

6643223 is a wasteful number, since it uses less digits than its factorization.

6643223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201.

The product of its digits is 5184, while the sum is 26.

The square root of 6643223 is about 2577.4450527606. The cubic root of 6643223 is about 187.9863333207.

Adding to 6643223 its reverse (3223466), we get a palindrome (9866689).

The spelling of 6643223 in words is "six million, six hundred forty-three thousand, two hundred twenty-three".