243857855668 has 18 divisors (see below), whose sum is σ = 496424920866. Its totient is φ = 104510509488.

The previous prime is 243857855581. The next prime is 243857855707. The reversal of 243857855668 is 866558758342.

243857855668 is digitally balanced in base 2, 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 only one way, i.e., 243155499664 + 702356004 = 493108^2 + 26502^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 622086171 + ... + 622086562.

Almost surely, 2^243857855668 is an apocalyptic number.

243857855668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

243857855668 is an abundant number, since it is smaller than the sum of its proper divisors (252567065198).

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

243857855668 is a wasteful number, since it uses less digits than its factorization.

243857855668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244172751 (or 1244172742 counting only the distinct ones).

The product of its digits is 387072000, while the sum is 67.

The spelling of 243857855668 in words is "two hundred forty-three billion, eight hundred fifty-seven million, eight hundred fifty-five thousand, six hundred sixty-eight".