12115323565 has 4 divisors (see below), whose sum is σ = 14538388284. Its totient is φ = 9692258848.

The previous prime is 12115323557. The next prime is 12115323641. The reversal of 12115323565 is 56532351121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56532351121 = 127 ⋅445136623.

It can be written as a sum of positive squares in 2 ways, for example, as 5713243396 + 6402080169 = 75586^2 + 80013^2 .

It is a cyclic number.

It is not a de Polignac number, because 12115323565 - 2³ = 12115323557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12115323565.

It is a congruent 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, 1211532352 + ... + 1211532361.

It is an arithmetic number, because the mean of its divisors is an integer number (3634597071).

Almost surely, 2^12115323565 is an apocalyptic number.

It is an amenable number.

12115323565 is a deficient number, since it is larger than the sum of its proper divisors (2423064719).

12115323565 is an equidigital number, since it uses as much as digits as its factorization.

12115323565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423064718.

The product of its digits is 27000, while the sum is 34.

Adding to 12115323565 its reverse (56532351121), we get a palindrome (68647674686).

The spelling of 12115323565 in words is "twelve billion, one hundred fifteen million, three hundred twenty-three thousand, five hundred sixty-five".