11215566 has 24 divisors (see below), whose sum is σ = 24373440. Its totient is φ = 3727296.

The previous prime is 11215549. The next prime is 11215579. The reversal of 11215566 is 66551211.

It is a happy number.

11215566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7075 + ... + 8513.

It is an arithmetic number, because the mean of its divisors is an integer number (1015560).

Almost surely, 2^11215566 is an apocalyptic number.

11215566 is an abundant number, since it is smaller than the sum of its proper divisors (13157874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11215566 is a wasteful number, since it uses less digits than its factorization.

11215566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880 (or 1877 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 11215566 is about 3348.9649147162. The cubic root of 11215566 is about 223.8413922917.

Adding to 11215566 its reverse (66551211), we get a palindrome (77766777).

It can be divided in two parts, 11215 and 566, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 11215566 in words is "eleven million, two hundred fifteen thousand, five hundred sixty-six".