6643263 has 12 divisors (see below), whose sum is σ = 9736664. Its totient is φ = 4026000.

The previous prime is 6643261. The next prime is 6643283. The reversal of 6643263 is 3623466.

It is not a de Polignac number, because 6643263 - 2¹ = 6643261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6643263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8788 + ... + 9513.

Almost surely, 2^6643263 is an apocalyptic number.

6643263 is a deficient number, since it is larger than the sum of its proper divisors (3093401).

6643263 is a wasteful number, since it uses less digits than its factorization.

6643263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18326 (or 18315 counting only the distinct ones).

The product of its digits is 15552, while the sum is 30.

The square root of 6643263 is about 2577.4528123712. The cubic root of 6643263 is about 187.9867106194.

The spelling of 6643263 in words is "six million, six hundred forty-three thousand, two hundred sixty-three".