12043645636 has 12 divisors (see below), whose sum is σ = 22992414480. Its totient is φ = 5474384360.

The previous prime is 12043645589. The next prime is 12043645639. The reversal of 12043645636 is 63654634021.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12043645639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136859566 + ... + 136859653.

It is an arithmetic number, because the mean of its divisors is an integer number (1916034540).

Almost surely, 2^12043645636 is an apocalyptic number.

It is an amenable number.

12043645636 is a deficient number, since it is larger than the sum of its proper divisors (10948768844).

12043645636 is a wasteful number, since it uses less digits than its factorization.

12043645636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273719234 (or 273719232 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

It can be divided in two parts, 1204364 and 5636, that added together give a square (1210000 = 1100²).

The spelling of 12043645636 in words is "twelve billion, forty-three million, six hundred forty-five thousand, six hundred thirty-six".