12166665 has 16 divisors (see below), whose sum is σ = 22247808. Its totient is φ = 5561856.

The previous prime is 12166607. The next prime is 12166667. The reversal of 12166665 is 56666121.

12166665 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 12166665 - 2⁷ = 12166537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12166667) 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 15 ways as a sum of consecutive naturals, for example, 57832 + ... + 58041.

It is an arithmetic number, because the mean of its divisors is an integer number (1390488).

Almost surely, 2^12166665 is an apocalyptic number.

12166665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12166665 is a deficient number, since it is larger than the sum of its proper divisors (10081143).

12166665 is a wasteful number, since it uses less digits than its factorization.

12166665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115888.

The product of its digits is 12960, while the sum is 33.

The square root of 12166665 is about 3488.0746838335. The cubic root of 12166665 is about 229.9978890796.

The spelling of 12166665 in words is "twelve million, one hundred sixty-six thousand, six hundred sixty-five".