11180665 has 4 divisors (see below), whose sum is σ = 13416804. Its totient is φ = 8944528.

The previous prime is 11180651. The next prime is 11180669. The reversal of 11180665 is 56608111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56608111 = 7 ⋅8086873.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 3250809 = 2816^2 + 1803^2 .

It is a cyclic number.

It is not a de Polignac number, because 11180665 - 2¹⁷ = 11049593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11180669) 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, 1118062 + ... + 1118071.

It is an arithmetic number, because the mean of its divisors is an integer number (3354201).

Almost surely, 2^11180665 is an apocalyptic number.

It is an amenable number.

11180665 is a deficient number, since it is larger than the sum of its proper divisors (2236139).

11180665 is an equidigital number, since it uses as much as digits as its factorization.

11180665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236138.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 11180665 is about 3343.7501401869. The cubic root of 11180665 is about 223.6089651456.

Adding to 11180665 its reverse (56608111), we get a palindrome (67788776).

The spelling of 11180665 in words is "eleven million, one hundred eighty thousand, six hundred sixty-five".