12521188666 has 16 divisors (see below), whose sum is σ = 21619321920. Its totient is φ = 5327616960.

The previous prime is 12521188639. The next prime is 12521188681. The reversal of 12521188666 is 66688112521.

12521188666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 7 ways as a sum of consecutive naturals, for example, 3215215 + ... + 3219106.

It is an arithmetic number, because the mean of its divisors is an integer number (1351207620).

Almost surely, 2^12521188666 is an apocalyptic number.

12521188666 is a deficient number, since it is larger than the sum of its proper divisors (9098133254).

12521188666 is a wasteful number, since it uses less digits than its factorization.

12521188666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6434469.

The product of its digits is 276480, while the sum is 46.

The spelling of 12521188666 in words is "twelve billion, five hundred twenty-one million, one hundred eighty-eight thousand, six hundred sixty-six".