12566216656 has 40 divisors (see below), whose sum is σ = 29289682880. Its totient is φ = 5102072064.

The previous prime is 12566216653. The next prime is 12566216659. The reversal of 12566216656 is 65661266521.

12566216656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12566216653) and next prime (12566216659).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566216653) 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 7 ways as a sum of consecutive naturals, for example, 2950461 + ... + 2954716.

It is an arithmetic number, because the mean of its divisors is an integer number (732242072).

Almost surely, 2^12566216656 is an apocalyptic number.

12566216656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12566216656 is an abundant number, since it is smaller than the sum of its proper divisors (16723466224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12566216656 is a wasteful number, since it uses less digits than its factorization.

12566216656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905211 (or 5905205 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

The spelling of 12566216656 in words is "twelve billion, five hundred sixty-six million, two hundred sixteen thousand, six hundred fifty-six".