2011566 has 8 divisors (see below), whose sum is σ = 4023144. Its totient is φ = 670520.

The previous prime is 2011561. The next prime is 2011573. The reversal of 2011566 is 6651102.

It is a happy number.

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

2011566 is an admirable number.

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167625 + ... + 167636.

It is an arithmetic number, because the mean of its divisors is an integer number (502893).

2^2011566 is an apocalyptic number.

2011566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2011566 is a wasteful number, since it uses less digits than its factorization.

2011566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335266.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2011566 is about 1418.2968659628. The cubic root of 2011566 is about 126.2345090950.

Adding to 2011566 its reverse (6651102), we get a palindrome (8662668).

The spelling of 2011566 in words is "two million, eleven thousand, five hundred sixty-six".