6643331 has 8 divisors (see below), whose sum is σ = 7219200. Its totient is φ = 6090120.

The previous prime is 6643321. The next prime is 6643333. The reversal of 6643331 is 1333466.

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

It is a cyclic number.

It is not a de Polignac number, because 6643331 - 2¹⁴ = 6626947 is a prime.

It is a super-2 number, since 2×6643331² = 88267693551122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6643331.

It is not an unprimeable number, because it can be changed into a prime (6643333) 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, 5051 + ... + 6228.

It is an arithmetic number, because the mean of its divisors is an integer number (902400).

Almost surely, 2^6643331 is an apocalyptic number.

6643331 is a deficient number, since it is larger than the sum of its proper divisors (575869).

6643331 is a wasteful number, since it uses less digits than its factorization.

6643331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11329.

The product of its digits is 3888, while the sum is 26.

The square root of 6643331 is about 2577.4660036555. The cubic root of 6643331 is about 187.9873520237.

Adding to 6643331 its reverse (1333466), we get a palindrome (7976797).

The spelling of 6643331 in words is "six million, six hundred forty-three thousand, three hundred thirty-one".