6643933 has 4 divisors (see below), whose sum is σ = 6649180. Its totient is φ = 6638688.

The previous prime is 6643919. The next prime is 6643969. The reversal of 6643933 is 3393466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 675684 + 5968249 = 822^2 + 2443^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643933 - 2¹⁷ = 6512861 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643993) 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, 583 + ... + 3691.

It is an arithmetic number, because the mean of its divisors is an integer number (1662295).

Almost surely, 2^6643933 is an apocalyptic number.

It is an amenable number.

6643933 is a deficient number, since it is larger than the sum of its proper divisors (5247).

6643933 is a wasteful number, since it uses less digits than its factorization.

6643933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246.

The product of its digits is 34992, while the sum is 34.

The square root of 6643933 is about 2577.5827823758. The cubic root of 6643933 is about 187.9930301475.

The spelling of 6643933 in words is "six million, six hundred forty-three thousand, nine hundred thirty-three".