2565655 has 4 divisors (see below), whose sum is σ = 3078792. Its totient is φ = 2052520.

The previous prime is 2565649. The next prime is 2565671. The reversal of 2565655 is 5565652.

It is a happy number.

2565655 is digitally balanced in base 2, 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.

It is not a de Polignac number, because 2565655 - 2¹⁷ = 2434583 is a prime.

It is a Duffinian number.

2565655 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2565655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256561 + ... + 256570.

It is an arithmetic number, because the mean of its divisors is an integer number (769698).

2^2565655 is an apocalyptic number.

2565655 is a deficient number, since it is larger than the sum of its proper divisors (513137).

2565655 is an equidigital number, since it uses as much as digits as its factorization.

2565655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513136.

The product of its digits is 45000, while the sum is 34.

The square root of 2565655 is about 1601.7662126540. The cubic root of 2565655 is about 136.8987299266.

The spelling of 2565655 in words is "two million, five hundred sixty-five thousand, six hundred fifty-five".