243123455205 has 32 divisors (see below), whose sum is σ = 435622809600. Its totient is φ = 128644842816.

The previous prime is 243123455153. The next prime is 243123455219. The reversal of 243123455205 is 502554321342.

243123455205 is a `hidden beast` number, since 2 + 4 + 3 + 123 + 4 + 5 + 520 + 5 = 666.

It is not a de Polignac number, because 243123455205 - 2¹³ = 243123447013 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243123455205.

It is a congruent 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, 7073070 + ... + 7107359.

It is an arithmetic number, because the mean of its divisors is an integer number (13613212800).

Almost surely, 2^243123455205 is an apocalyptic number.

It is an amenable number.

243123455205 is a deficient number, since it is larger than the sum of its proper divisors (192499354395).

243123455205 is a wasteful number, since it uses less digits than its factorization.

243123455205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14180570 (or 14180564 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 243123455205 its reverse (502554321342), we get a palindrome (745677776547).

The spelling of 243123455205 in words is "two hundred forty-three billion, one hundred twenty-three million, four hundred fifty-five thousand, two hundred five".