2666443 has 4 divisors (see below), whose sum is σ = 2871568. Its totient is φ = 2461320.

The previous prime is 2666429. The next prime is 2666453. The reversal of 2666443 is 3446662.

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

It is a cyclic number.

It is not a de Polignac number, because 2666443 - 2⁹ = 2665931 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 6⁴ + 6⁷ + 6⁸ + 4³ + 4⁶ + 3¹¹ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2666423) 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, 102543 + ... + 102568.

It is an arithmetic number, because the mean of its divisors is an integer number (717892).

2^2666443 is an apocalyptic number.

2666443 is a deficient number, since it is larger than the sum of its proper divisors (205125).

2666443 is a wasteful number, since it uses less digits than its factorization.

2666443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205124.

The product of its digits is 20736, while the sum is 31.

The square root of 2666443 is about 1632.9246767686. The cubic root of 2666443 is about 138.6683777166.

The spelling of 2666443 in words is "two million, six hundred sixty-six thousand, four hundred forty-three".