561105565 has 4 divisors (see below), whose sum is σ = 673326684. Its totient is φ = 448884448.

The previous prime is 561105551. The next prime is 561105569. The reversal of 561105565 is 565501165.

561105565 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 can be written as a sum of positive squares in 2 ways, for example, as 235591801 + 325513764 = 15349^2 + 18042^2 .

It is a cyclic number.

It is not a de Polignac number, because 561105565 - 2⁷ = 561105437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561105565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561105569) 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, 56110552 + ... + 56110561.

It is an arithmetic number, because the mean of its divisors is an integer number (168331671).

Almost surely, 2^561105565 is an apocalyptic number.

It is an amenable number.

561105565 is a deficient number, since it is larger than the sum of its proper divisors (112221119).

561105565 is a wasteful number, since it uses less digits than its factorization.

561105565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112221118.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 561105565 is about 23687.6669387257. Note that the first 3 decimals coincide. The cubic root of 561105565 is about 824.7991258725.

The spelling of 561105565 in words is "five hundred sixty-one million, one hundred five thousand, five hundred sixty-five".