2566645 has 16 divisors (see below), whose sum is σ = 3294720. Its totient is φ = 1915200.

The previous prime is 2566637. The next prime is 2566651. The reversal of 2566645 is 5466652.

It is not a de Polignac number, because 2566645 - 2³ = 2566637 is a prime.

2566645 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2566645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4210 + ... + 4780.

It is an arithmetic number, because the mean of its divisors is an integer number (205920).

2^2566645 is an apocalyptic number.

It is an amenable number.

2566645 is a deficient number, since it is larger than the sum of its proper divisors (728075).

2566645 is a wasteful number, since it uses less digits than its factorization.

2566645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its digits is 43200, while the sum is 34.

The square root of 2566645 is about 1602.0752167111. The cubic root of 2566645 is about 136.9163358679.

The spelling of 2566645 in words is "two million, five hundred sixty-six thousand, six hundred forty-five".