2005663 has 4 divisors (see below), whose sum is σ = 2188008. Its totient is φ = 1823320.

The previous prime is 2005613. The next prime is 2005667. The reversal of 2005663 is 3665002.

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 2005663 - 2⁹ = 2005151 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005667) 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, 91156 + ... + 91177.

It is an arithmetic number, because the mean of its divisors is an integer number (547002).

2^2005663 is an apocalyptic number.

2005663 is a deficient number, since it is larger than the sum of its proper divisors (182345).

2005663 is a wasteful number, since it uses less digits than its factorization.

2005663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182344.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 2005663 is about 1416.2143199389. The cubic root of 2005663 is about 126.1109084777.

The spelling of 2005663 in words is "two million, five thousand, six hundred sixty-three".