6643433 has 4 divisors (see below), whose sum is σ = 6712020. Its totient is φ = 6574848.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643433 is 3343466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3374569 + 3268864 = 1837^2 + 1808^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643433 - 2¹⁰ = 6642409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6643396 and 6643405.

It is not an unprimeable number, because it can be changed into a prime (6643423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34148 + ... + 34341.

It is an arithmetic number, because the mean of its divisors is an integer number (1678005).

Almost surely, 2^6643433 is an apocalyptic number.

It is an amenable number.

6643433 is a deficient number, since it is larger than the sum of its proper divisors (68587).

6643433 is an equidigital number, since it uses as much as digits as its factorization.

6643433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68586.

The product of its digits is 15552, while the sum is 29.

The square root of 6643433 is about 2577.4857904555. The cubic root of 6643433 is about 187.9883141220.

Adding to 6643433 its reverse (3343466), we get a palindrome (9986899).

The spelling of 6643433 in words is "six million, six hundred forty-three thousand, four hundred thirty-three".