2565005566 has 8 divisors (see below), whose sum is σ = 3847880880. Its totient is φ = 1282378608.

The previous prime is 2565005561. The next prime is 2565005579. The reversal of 2565005566 is 6655005652.

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

It is a super-2 number, since 2×2565005566² = 13158507107221960712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565005561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33666 + ... + 79141.

It is an arithmetic number, because the mean of its divisors is an integer number (480985110).

Almost surely, 2^2565005566 is an apocalyptic number.

2565005566 is a deficient number, since it is larger than the sum of its proper divisors (1282875314).

2565005566 is a wasteful number, since it uses less digits than its factorization.

2565005566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124178.

The product of its (nonzero) digits is 270000, while the sum is 40.

The square root of 2565005566 is about 50645.8839986035. The cubic root of 2565005566 is about 1368.8717807564.

The spelling of 2565005566 in words is "two billion, five hundred sixty-five million, five thousand, five hundred sixty-six".