12656990808 has 192 divisors, whose sum is σ = 42845137920. Its totient is φ = 3279283200.

The previous prime is 12656990783. The next prime is 12656990861. The reversal of 12656990808 is 80809965621.

It is a happy number.

12656990808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 47 ways as a sum of consecutive naturals, for example, 2386816 + ... + 2392112.

It is an arithmetic number, because the mean of its divisors is an integer number (223151760).

Almost surely, 2^12656990808 is an apocalyptic number.

12656990808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12656990808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21422568960).

12656990808 is an abundant number, since it is smaller than the sum of its proper divisors (30188147112).

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

12656990808 is a wasteful number, since it uses less digits than its factorization.

12656990808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5758 (or 5751 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 12656990808 in words is "twelve billion, six hundred fifty-six million, nine hundred ninety thousand, eight hundred eight".