12636943812 has 168 divisors, whose sum is σ = 35293267296. Its totient is φ = 3943551744.

The previous prime is 12636943763. The next prime is 12636943817. The reversal of 12636943812 is 21834963621.

12636943812 is a `hidden beast` number, since 1 + 2 + 636 + 9 + 4 + 3 + 8 + 1 + 2 = 666.

12636943812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12636943817) 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 55 ways as a sum of consecutive naturals, for example, 11252283 + ... + 11253405.

It is an arithmetic number, because the mean of its divisors is an integer number (210078972).

Almost surely, 2^12636943812 is an apocalyptic number.

12636943812 is a gapful number since it is divisible by the number (12) 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 12636943812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17646633648).

12636943812 is an abundant number, since it is smaller than the sum of its proper divisors (22656323484).

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

12636943812 is a wasteful number, since it uses less digits than its factorization.

12636943812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389 (or 1372 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The spelling of 12636943812 in words is "twelve billion, six hundred thirty-six million, nine hundred forty-three thousand, eight hundred twelve".