12165657 has 16 divisors (see below), whose sum is σ = 18844032. Its totient is φ = 6837120.

The previous prime is 12165631. The next prime is 12165661. The reversal of 12165657 is 75656121.

It is not a de Polignac number, because 12165657 - 2⁸ = 12165401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12165607) 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, 3468 + ... + 6029.

It is an arithmetic number, because the mean of its divisors is an integer number (1177752).

Almost surely, 2^12165657 is an apocalyptic number.

It is an amenable number.

12165657 is a deficient number, since it is larger than the sum of its proper divisors (6678375).

12165657 is an equidigital number, since it uses as much as digits as its factorization.

12165657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568.

The product of its digits is 12600, while the sum is 33.

The square root of 12165657 is about 3487.9301885216. The cubic root of 12165657 is about 229.9915371807.

It can be divided in two parts, 121 and 65657, that multiplied together give a palindrome (7944497).

The spelling of 12165657 in words is "twelve million, one hundred sixty-five thousand, six hundred fifty-seven".