13231252565 has 4 divisors (see below), whose sum is σ = 15877503084. Its totient is φ = 10585002048.

The previous prime is 13231252537. The next prime is 13231252633. The reversal of 13231252565 is 56525213231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56525213231 = 17 ⋅3325012543.

It can be written as a sum of positive squares in 2 ways, for example, as 5877675556 + 7353577009 = 76666^2 + 85753^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231252565 - 2¹⁶ = 13231187029 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 1323125252 + ... + 1323125261.

It is an arithmetic number, because the mean of its divisors is an integer number (3969375771).

Almost surely, 2^13231252565 is an apocalyptic number.

It is an amenable number.

13231252565 is a deficient number, since it is larger than the sum of its proper divisors (2646250519).

13231252565 is an equidigital number, since it uses as much as digits as its factorization.

13231252565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646250518.

The product of its digits is 54000, while the sum is 35.

Adding to 13231252565 its reverse (56525213231), we get a palindrome (69756465796).

The spelling of 13231252565 in words is "thirteen billion, two hundred thirty-one million, two hundred fifty-two thousand, five hundred sixty-five".