12116565 has 12 divisors (see below), whose sum is σ = 21002124. Its totient is φ = 6462144.

The previous prime is 12116557. The next prime is 12116569. The reversal of 12116565 is 56561121.

It is a happy number.

12116565 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 656 + 5 = 666.

12116565 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1580049 + 10536516 = 1257^2 + 3246^2 .

It is not a de Polignac number, because 12116565 - 2³ = 12116557 is a prime.

It is a super-2 number, since 2×12116565² = 293622294798450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12116569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134584 + ... + 134673.

It is an arithmetic number, because the mean of its divisors is an integer number (1750177).

Almost surely, 2^12116565 is an apocalyptic number.

12116565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12116565 is a deficient number, since it is larger than the sum of its proper divisors (8885559).

12116565 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 8 representation: 12116565 = (56161125)₈.

12116565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269268 (or 269265 counting only the distinct ones).

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

The square root of 12116565 is about 3480.8856631610. The cubic root of 12116565 is about 229.6817589846.

Adding to 12116565 its reverse (56561121), we get a palindrome (68677686).

It can be divided in two parts, 1211 and 6565, that added together give a 5-th power (7776 = 6⁵).

The spelling of 12116565 in words is "twelve million, one hundred sixteen thousand, five hundred sixty-five".