243521543225 has 24 divisors (see below), whose sum is σ = 302864365440. Its totient is φ = 194238989120.

The previous prime is 243521543207. The next prime is 243521543269. The reversal of 243521543225 is 522345125342.

243521543225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243521543225 - 2⁸ = 243521542969 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 11727302 + ... + 11748048.

It is an arithmetic number, because the mean of its divisors is an integer number (12619348560).

Almost surely, 2^243521543225 is an apocalyptic number.

243521543225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243521543225 is a deficient number, since it is larger than the sum of its proper divisors (59342822215).

243521543225 is a wasteful number, since it uses less digits than its factorization.

243521543225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22129 (or 22124 counting only the distinct ones).

The product of its digits is 288000, while the sum is 38.

Adding to 243521543225 its reverse (522345125342), we get a palindrome (765866668567).

The spelling of 243521543225 in words is "two hundred forty-three billion, five hundred twenty-one million, five hundred forty-three thousand, two hundred twenty-five".