243263321113265 has 4 divisors (see below), whose sum is σ = 291915985335924. Its totient is φ = 194610656890608.

The previous prime is 243263321113247. The next prime is 243263321113271. The reversal of 243263321113265 is 562311123362342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 183337205602849 + 59926115510416 = 13540207^2 + 7741196^2 .

It is a cyclic number.

It is not a de Polignac number, because 243263321113265 - 2⁴² = 238865274602161 is a prime.

It is a super-2 number, since 2×243263321113265² (a number of 30 digits) contains 22 as substring.

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, 24326332111322 + ... + 24326332111331.

It is an arithmetic number, because the mean of its divisors is an integer number (72978996333981).

Almost surely, 2^{243263321113265} is an apocalyptic number.

It is an amenable number.

243263321113265 is a deficient number, since it is larger than the sum of its proper divisors (48652664222659).

243263321113265 is an equidigital number, since it uses as much as digits as its factorization.

243263321113265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48652664222658.

The product of its digits is 933120, while the sum is 44.

The spelling of 243263321113265 in words is "two hundred forty-three trillion, two hundred sixty-three billion, three hundred twenty-one million, one hundred thirteen thousand, two hundred sixty-five".