11566642 has 4 divisors (see below), whose sum is σ = 17349966. Its totient is φ = 5783320.

The previous prime is 11566619. The next prime is 11566651. The reversal of 11566642 is 24666511.

11566642 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, and also an emirpimes, since its reverse is a distinct semiprime: 24666511 = 23 ⋅1072457.

It can be written as a sum of positive squares in only one way, i.e., 7845601 + 3721041 = 2801^2 + 1929^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2891659 + ... + 2891662.

Almost surely, 2^11566642 is an apocalyptic number.

11566642 is a deficient number, since it is larger than the sum of its proper divisors (5783324).

11566642 is an equidigital number, since it uses as much as digits as its factorization.

11566642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5783323.

The product of its digits is 8640, while the sum is 31.

The square root of 11566642 is about 3400.9766244419. The cubic root of 11566642 is about 226.1530406758.

The spelling of 11566642 in words is "eleven million, five hundred sixty-six thousand, six hundred forty-two".