2566 has 4 divisors (see below), whose sum is σ = 3852. Its totient is φ = 1282.

The previous prime is 2557. The next prime is 2579. The reversal of 2566 is 6652.

2566 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

2566 is strictly pandigital in base 5.

It is a plaindrome in base 10, base 12 and base 13.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640 + ... + 643.

It is an arithmetic number, because the mean of its divisors is an integer number (963).

2²⁵⁶⁶ is an apocalyptic number.

2566 is a deficient number, since it is larger than the sum of its proper divisors (1286).

2566 is a wasteful number, since it uses less digits than its factorization.

2566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285.

The product of its digits is 360, while the sum is 19.

The square root of 2566 is about 50.6557005677. The cubic root of 2566 is about 13.6904865844.

Adding to 2566 its product of digits (360), we get a triangular number (2926 = T₇₆).

It can be divided in two parts, 256 and 6, that added together give a palindrome (262).

The spelling of 2566 in words is "two thousand, five hundred sixty-six".