243125215555 has 32 divisors (see below), whose sum is σ = 296228275200. Its totient is φ = 191534483712.

The previous prime is 243125215499. The next prime is 243125215681. The reversal of 243125215555 is 555512521342.

It is a cyclic number.

It is not a de Polignac number, because 243125215555 - 2¹⁷ = 243125084483 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204822672 + ... + 204823858.

It is an arithmetic number, because the mean of its divisors is an integer number (9257133600).

Almost surely, 2^243125215555 is an apocalyptic number.

243125215555 is a deficient number, since it is larger than the sum of its proper divisors (53103059645).

243125215555 is a wasteful number, since it uses less digits than its factorization.

243125215555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763.

The product of its digits is 300000, while the sum is 40.

Adding to 243125215555 its reverse (555512521342), we get a palindrome (798637736897).

The spelling of 243125215555 in words is "two hundred forty-three billion, one hundred twenty-five million, two hundred fifteen thousand, five hundred fifty-five".