243243242555 has 4 divisors (see below), whose sum is σ = 291891891072. Its totient is φ = 194594594040.

The previous prime is 243243242531. The next prime is 243243242569. The reversal of 243243242555 is 555242342342.

243243242555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 243243242555 - 2⁸ = 243243242299 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 24324324251 + ... + 24324324260.

It is an arithmetic number, because the mean of its divisors is an integer number (72972972768).

Almost surely, 2^243243242555 is an apocalyptic number.

243243242555 is a deficient number, since it is larger than the sum of its proper divisors (48648648517).

243243242555 is an equidigital number, since it uses as much as digits as its factorization.

243243242555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48648648516.

The product of its digits is 1152000, while the sum is 41.

Adding to 243243242555 its reverse (555242342342), we get a palindrome (798485584897).

The spelling of 243243242555 in words is "two hundred forty-three billion, two hundred forty-three million, two hundred forty-two thousand, five hundred fifty-five".