2566505 has 8 divisors (see below), whose sum is σ = 3163272. Its totient is φ = 1997568.

The previous prime is 2566489. The next prime is 2566513. The reversal of 2566505 is 5056652.

2566505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 659344 + 1907161 = 812^2 + 1381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2566505 - 2⁴ = 2566489 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 6752 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (395409).

2^2566505 is an apocalyptic number.

It is an amenable number.

2566505 is a deficient number, since it is larger than the sum of its proper divisors (596767).

2566505 is a wasteful number, since it uses less digits than its factorization.

2566505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13915.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 2566505 is about 1602.0315227860. The cubic root of 2566505 is about 136.9138464137.

The spelling of 2566505 in words is "two million, five hundred sixty-six thousand, five hundred five".