12665066121 has 40 divisors (see below), whose sum is σ = 19210935744. Its totient is φ = 8314215840.

The previous prime is 12665066111. The next prime is 12665066129. The reversal of 12665066121 is 12166056621.

12665066121 is a `hidden beast` number, since 1 + 26 + 6 + 506 + 6 + 121 = 666.

12665066121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12665066121 - 2²³ = 12656677513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12665066129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1505890 + ... + 1514276.

Almost surely, 2^12665066121 is an apocalyptic number.

It is an amenable number.

12665066121 is a deficient number, since it is larger than the sum of its proper divisors (6545869623).

12665066121 is a wasteful number, since it uses less digits than its factorization.

12665066121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8683 (or 8674 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 12665066121 in words is "twelve billion, six hundred sixty-five million, sixty-six thousand, one hundred twenty-one".