6643323 has 8 divisors (see below), whose sum is σ = 9842000. Its totient is φ = 4428864.

The previous prime is 6643321. The next prime is 6643333. The reversal of 6643323 is 3233466.

It is not a de Polignac number, because 6643323 - 2¹ = 6643321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 246049 = 6643323 / (6 + 6 + 4 + 3 + 3 + 2 + 3).

It is a d-powerful number, because it can be written as 6⁴ + 6⁸ + 4 + 3⁵ + 3¹¹ + 2¹¹ + 3¹⁴ .

It is a Duffinian number.

6643323 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6643321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122998 + ... + 123051.

It is an arithmetic number, because the mean of its divisors is an integer number (1230250).

Almost surely, 2^6643323 is an apocalyptic number.

6643323 is a deficient number, since it is larger than the sum of its proper divisors (3198677).

6643323 is a wasteful number, since it uses less digits than its factorization.

6643323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246058 (or 246052 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

The square root of 6643323 is about 2577.4644517432. The cubic root of 6643323 is about 187.9872765646.

Adding to 6643323 its reverse (3233466), we get a palindrome (9876789).

The spelling of 6643323 in words is "six million, six hundred forty-three thousand, three hundred twenty-three".