243243541505 has 16 divisors (see below), whose sum is σ = 308657115648. Its totient is φ = 183724464000.

The previous prime is 243243541487. The next prime is 243243541517. The reversal of 243243541505 is 505145342342.

It is not a de Polignac number, because 243243541505 - 2¹⁰ = 243243540481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19131611 + ... + 19144320.

It is an arithmetic number, because the mean of its divisors is an integer number (19291069728).

Almost surely, 2^243243541505 is an apocalyptic number.

It is an amenable number.

243243541505 is a deficient number, since it is larger than the sum of its proper divisors (65413574143).

243243541505 is a wasteful number, since it uses less digits than its factorization.

243243541505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38276008.

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

Adding to 243243541505 its reverse (505145342342), we get a palindrome (748388883847).

The spelling of 243243541505 in words is "two hundred forty-three billion, two hundred forty-three million, five hundred forty-one thousand, five hundred five".