243306261256 has 16 divisors (see below), whose sum is σ = 456493016700. Its totient is φ = 121574790144.

The previous prime is 243306261251. The next prime is 243306261269. The reversal of 243306261256 is 652162603342.

243306261256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 174014122500 + 69292138756 = 417150^2 + 263234^2 .

It is not an unprimeable number, because it can be changed into a prime (243306261251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9779361 + ... + 9804208.

Almost surely, 2^243306261256 is an apocalyptic number.

It is an amenable number.

243306261256 is a deficient number, since it is larger than the sum of its proper divisors (213186755444).

243306261256 is a wasteful number, since it uses less digits than its factorization.

243306261256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19585128 (or 19585124 counting only the distinct ones).

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

Adding to 243306261256 its reverse (652162603342), we get a palindrome (895468864598).

The spelling of 243306261256 in words is "two hundred forty-three billion, three hundred six million, two hundred sixty-one thousand, two hundred fifty-six".