243155205242 has 16 divisors (see below), whose sum is σ = 373704819264. Its totient is φ = 118588140000.

The previous prime is 243155205229. The next prime is 243155205247. The reversal of 243155205242 is 242502551342.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (243155205247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106517 + ... + 705447.

It is an arithmetic number, because the mean of its divisors is an integer number (23356551204).

Almost surely, 2^243155205242 is an apocalyptic number.

243155205242 is a deficient number, since it is larger than the sum of its proper divisors (130549614022).

243155205242 is a wasteful number, since it uses less digits than its factorization.

243155205242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603925.

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 243155205242 its reverse (242502551342), we get a palindrome (485657756584).

The spelling of 243155205242 in words is "two hundred forty-three billion, one hundred fifty-five million, two hundred five thousand, two hundred forty-two".