243873721155 has 32 divisors (see below), whose sum is σ = 396643238208. Its totient is φ = 127918080000.

The previous prime is 243873721127. The next prime is 243873721177. The reversal of 243873721155 is 551127378342.

It is not a de Polignac number, because 243873721155 - 2⁸ = 243873720899 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14632587 + ... + 14649243.

It is an arithmetic number, because the mean of its divisors is an integer number (12395101194).

Almost surely, 2^243873721155 is an apocalyptic number.

243873721155 is a deficient number, since it is larger than the sum of its proper divisors (152769517053).

243873721155 is a wasteful number, since it uses less digits than its factorization.

243873721155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32727.

The product of its digits is 1411200, while the sum is 48.

The spelling of 243873721155 in words is "two hundred forty-three billion, eight hundred seventy-three million, seven hundred twenty-one thousand, one hundred fifty-five".