12543303656 has 16 divisors (see below), whose sum is σ = 25327824900. Its totient is φ = 5789217024.

The previous prime is 12543303599. The next prime is 12543303683. The reversal of 12543303656 is 65630334521.

It can be written as a sum of positive squares in 2 ways, for example, as 9645204100 + 2898099556 = 98210^2 + 53834^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60304241 + ... + 60304448.

Almost surely, 2^12543303656 is an apocalyptic number.

It is an amenable number.

12543303656 is an abundant number, since it is smaller than the sum of its proper divisors (12784521244).

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

12543303656 is a wasteful number, since it uses less digits than its factorization.

12543303656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120608708 (or 120608704 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 38.

The spelling of 12543303656 in words is "twelve billion, five hundred forty-three million, three hundred three thousand, six hundred fifty-six".