12513165205 has 4 divisors (see below), whose sum is σ = 15015798252. Its totient is φ = 10010532160.

The previous prime is 12513165151. The next prime is 12513165233. The reversal of 12513165205 is 50256131521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50256131521 = 103 ⋅487923607.

It can be written as a sum of positive squares in 2 ways, for example, as 6272323204 + 6240842001 = 79198^2 + 78999^2 .

It is not a de Polignac number, because 12513165205 - 2⁹ = 12513164693 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251316516 + ... + 1251316525.

It is an arithmetic number, because the mean of its divisors is an integer number (3753949563).

Almost surely, 2^12513165205 is an apocalyptic number.

It is an amenable number.

12513165205 is a deficient number, since it is larger than the sum of its proper divisors (2502633047).

12513165205 is an equidigital number, since it uses as much as digits as its factorization.

12513165205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502633046.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 12513165205 its reverse (50256131521), we get a palindrome (62769296726).

It can be divided in two parts, 1251316 and 5205, that added together give a palindrome (1256521).

The spelling of 12513165205 in words is "twelve billion, five hundred thirteen million, one hundred sixty-five thousand, two hundred five".