11566161 has 6 divisors (see below), whose sum is σ = 16706690. Its totient is φ = 7710768.

The previous prime is 11566129. The next prime is 11566199. The reversal of 11566161 is 16166511.

11566161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9492561 + 2073600 = 3081^2 + 1440^2 .

It is not a de Polignac number, because 11566161 - 2⁵ = 11566129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11566361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642556 + ... + 642573.

Almost surely, 2^11566161 is an apocalyptic number.

It is an amenable number.

11566161 is a deficient number, since it is larger than the sum of its proper divisors (5140529).

11566161 is a wasteful number, since it uses less digits than its factorization.

11566161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285135 (or 1285132 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 11566161 is about 3400.9059087249. The cubic root of 11566161 is about 226.1499057665.

The spelling of 11566161 in words is "eleven million, five hundred sixty-six thousand, one hundred sixty-one".