2566855 has 4 divisors (see below), whose sum is σ = 3080232. Its totient is φ = 2053480.

The previous prime is 2566829. The next prime is 2566859. The reversal of 2566855 is 5586652.

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

It is a de Polignac number, because none of the positive numbers 2^k-2566855 is a prime.

It is a d-powerful number, because it can be written as 2⁸ + 5⁴ + 6² + 6² + 8⁷ + 5⁷ + 5⁸ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566859) 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, 256681 + ... + 256690.

It is an arithmetic number, because the mean of its divisors is an integer number (770058).

2^2566855 is an apocalyptic number.

2566855 is a deficient number, since it is larger than the sum of its proper divisors (513377).

2566855 is an equidigital number, since it uses as much as digits as its factorization.

2566855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513376.

The product of its digits is 72000, while the sum is 37.

The square root of 2566855 is about 1602.1407553645. The cubic root of 2566855 is about 136.9200698795.

The spelling of 2566855 in words is "two million, five hundred sixty-six thousand, eight hundred fifty-five".