12656331663 has 4 divisors (see below), whose sum is σ = 16875108888. Its totient is φ = 8437554440.

The previous prime is 12656331631. The next prime is 12656331719. The reversal of 12656331663 is 36613365621.

12656331663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12656331663 - 2⁵ = 12656331631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656331263) 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 3 ways as a sum of consecutive naturals, for example, 2109388608 + ... + 2109388613.

It is an arithmetic number, because the mean of its divisors is an integer number (4218777222).

Almost surely, 2^12656331663 is an apocalyptic number.

12656331663 is a deficient number, since it is larger than the sum of its proper divisors (4218777225).

12656331663 is an equidigital number, since it uses as much as digits as its factorization.

12656331663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218777224.

The product of its digits is 349920, while the sum is 42.

The spelling of 12656331663 in words is "twelve billion, six hundred fifty-six million, three hundred thirty-one thousand, six hundred sixty-three".