12006505556 has 6 divisors (see below), whose sum is σ = 21011384730. Its totient is φ = 6003252776.

The previous prime is 12006505547. The next prime is 12006505571. The reversal of 12006505556 is 65550560021.

12006505556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9206402500 + 2800103056 = 95950^2 + 52916^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1500813191 + ... + 1500813198.

It is an arithmetic number, because the mean of its divisors is an integer number (3501897455).

Almost surely, 2^12006505556 is an apocalyptic number.

It is an amenable number.

12006505556 is a deficient number, since it is larger than the sum of its proper divisors (9004879174).

12006505556 is a wasteful number, since it uses less digits than its factorization.

12006505556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001626393 (or 3001626391 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 12006505556 in words is "twelve billion, six million, five hundred five thousand, five hundred fifty-six".