2555663 has 4 divisors (see below), whose sum is σ = 2788008. Its totient is φ = 2323320.

The previous prime is 2555647. The next prime is 2555669. The reversal of 2555663 is 3665552.

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 2555663 - 2⁴ = 2555647 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 (2555669) 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, 116156 + ... + 116177.

It is an arithmetic number, because the mean of its divisors is an integer number (697002).

2^2555663 is an apocalyptic number.

2555663 is a deficient number, since it is larger than the sum of its proper divisors (232345).

2555663 is a wasteful number, since it uses less digits than its factorization.

2555663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232344.

The product of its digits is 27000, while the sum is 32.

The square root of 2555663 is about 1598.6441129908. The cubic root of 2555663 is about 136.7207803421.

The spelling of 2555663 in words is "two million, five hundred fifty-five thousand, six hundred sixty-three".