6665443 has 4 divisors (see below), whose sum is σ = 6670728. Its totient is φ = 6660160.

The previous prime is 6665437. The next prime is 6665497. The reversal of 6665443 is 3445666.

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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665443 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6665399 and 6665408.

It is not an unprimeable number, because it can be changed into a prime (6665413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480 + ... + 3682.

It is an arithmetic number, because the mean of its divisors is an integer number (1667682).

Almost surely, 2^6665443 is an apocalyptic number.

6665443 is a deficient number, since it is larger than the sum of its proper divisors (5285).

6665443 is a wasteful number, since it uses less digits than its factorization.

6665443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284.

The product of its digits is 51840, while the sum is 34.

The square root of 6665443 is about 2581.7519245660. The cubic root of 6665443 is about 188.1956899274.

The spelling of 6665443 in words is "six million, six hundred sixty-five thousand, four hundred forty-three".