243053915865 has 16 divisors (see below), whose sum is σ = 389409683328. Its totient is φ = 129454282496.

The previous prime is 243053915843. The next prime is 243053915893. The reversal of 243053915865 is 568519350342.

It is a cyclic number.

It is not a de Polignac number, because 243053915865 - 2³⁰ = 241980174041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10893024 + ... + 10915313.

It is an arithmetic number, because the mean of its divisors is an integer number (24338105208).

Almost surely, 2^243053915865 is an apocalyptic number.

It is an amenable number.

243053915865 is a deficient number, since it is larger than the sum of its proper divisors (146355767463).

243053915865 is a wasteful number, since it uses less digits than its factorization.

243053915865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21809088.

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 243053915865 in words is "two hundred forty-three billion, fifty-three million, nine hundred fifteen thousand, eight hundred sixty-five".