6643367 has 4 divisors (see below), whose sum is σ = 6660336. Its totient is φ = 6626400.

The previous prime is 6643361. The next prime is 6643381. The reversal of 6643367 is 7633466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7633466 = 2 ⋅3816733.

It is a cyclic number.

It is not a de Polignac number, because 6643367 - 2⁶ = 6643303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643361) 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, 7883 + ... + 8684.

It is an arithmetic number, because the mean of its divisors is an integer number (1665084).

Almost surely, 2^6643367 is an apocalyptic number.

6643367 is a deficient number, since it is larger than the sum of its proper divisors (16969).

6643367 is a wasteful number, since it uses less digits than its factorization.

6643367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16968.

The product of its digits is 54432, while the sum is 35.

The square root of 6643367 is about 2577.4729872493. The cubic root of 6643367 is about 187.9876915889.

Subtracting 6643367 from its reverse (7633466), we obtain a palindrome (990099).

The spelling of 6643367 in words is "six million, six hundred forty-three thousand, three hundred sixty-seven".