12166155 has 24 divisors (see below), whose sum is σ = 21660912. Its totient is φ = 6312384.

The previous prime is 12166139. The next prime is 12166159. The reversal of 12166155 is 55166121.

It is a happy number.

12166155 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12166155 - 2⁴ = 12166139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12166159) 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 23 ways as a sum of consecutive naturals, for example, 1989 + ... + 5318.

It is an arithmetic number, because the mean of its divisors is an integer number (902538).

Almost surely, 2^12166155 is an apocalyptic number.

12166155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12166155 is a deficient number, since it is larger than the sum of its proper divisors (9494757).

12166155 is a wasteful number, since it uses less digits than its factorization.

12166155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355 (or 7352 counting only the distinct ones).

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

The square root of 12166155 is about 3488.0015768345. The cubic root of 12166155 is about 229.9946753651.

It can be divided in two parts, 12166 and 155, that added together give a palindrome (12321).

The spelling of 12166155 in words is "twelve million, one hundred sixty-six thousand, one hundred fifty-five".