243325055515 has 4 divisors (see below), whose sum is σ = 291990066624. Its totient is φ = 194660044408.

The previous prime is 243325055471. The next prime is 243325055579. The reversal of 243325055515 is 515550523342.

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

It is a cyclic number.

It is not a de Polignac number, because 243325055515 - 2¹⁹ = 243324531227 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24332505547 + ... + 24332505556.

It is an arithmetic number, because the mean of its divisors is an integer number (72997516656).

Almost surely, 2^243325055515 is an apocalyptic number.

243325055515 is a deficient number, since it is larger than the sum of its proper divisors (48665011109).

243325055515 is an equidigital number, since it uses as much as digits as its factorization.

243325055515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48665011108.

The product of its (nonzero) digits is 450000, while the sum is 40.

Adding to 243325055515 its reverse (515550523342), we get a palindrome (758875578857).

The spelling of 243325055515 in words is "two hundred forty-three billion, three hundred twenty-five million, fifty-five thousand, five hundred fifteen".