561111166 has 16 divisors (see below), whose sum is σ = 1049351040. Its totient is φ = 218614680.

The previous prime is 561111157. The next prime is 561111209. The reversal of 561111166 is 661111165.

561111166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1821636 + ... + 1821943.

It is an arithmetic number, because the mean of its divisors is an integer number (65584440).

Almost surely, 2^561111166 is an apocalyptic number.

561111166 is a deficient number, since it is larger than the sum of its proper divisors (488239874).

561111166 is a wasteful number, since it uses less digits than its factorization.

561111166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643599.

The product of its digits is 1080, while the sum is 28.

The square root of 561111166 is about 23687.7851645104. The cubic root of 561111166 is about 824.8018702666.

Subtracting 561111166 from its reverse (661111165), we obtain a palindrome (99999999).

The spelling of 561111166 in words is "five hundred sixty-one million, one hundred eleven thousand, one hundred sixty-six".