243172138856 has 32 divisors (see below), whose sum is σ = 484604702400. Its totient is φ = 114068476800.

The previous prime is 243172138849. The next prime is 243172138961. The reversal of 243172138856 is 658831271342.

243172138856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 7750445 + ... + 7781756.

It is an arithmetic number, because the mean of its divisors is an integer number (15143896950).

Almost surely, 2^243172138856 is an apocalyptic number.

It is an amenable number.

243172138856 is a deficient number, since it is larger than the sum of its proper divisors (241432563544).

243172138856 is a wasteful number, since it uses less digits than its factorization.

243172138856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15532329 (or 15532325 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 50.

The spelling of 243172138856 in words is "two hundred forty-three billion, one hundred seventy-two million, one hundred thirty-eight thousand, eight hundred fifty-six".