12066556565 has 16 divisors (see below), whose sum is σ = 17521857792. Its totient is φ = 7787491584.

The previous prime is 12066556561. The next prime is 12066556643. The reversal of 12066556565 is 56565566021.

12066556565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12066556565 - 2² = 12066556561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12066556561) 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 15 ways as a sum of consecutive naturals, for example, 10139369 + ... + 10140558.

It is an arithmetic number, because the mean of its divisors is an integer number (1095116112).

Almost surely, 2^12066556565 is an apocalyptic number.

It is an amenable number.

12066556565 is a deficient number, since it is larger than the sum of its proper divisors (5455301227).

12066556565 is a wasteful number, since it uses less digits than its factorization.

12066556565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20279956.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 12066556565 in words is "twelve billion, sixty-six million, five hundred fifty-six thousand, five hundred sixty-five".