12656323145 has 4 divisors (see below), whose sum is σ = 15187587780. Its totient is φ = 10125058512.

The previous prime is 12656323129. The next prime is 12656323151. The reversal of 12656323145 is 54132365621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54132365621 = 1259 ⋅42996319.

It can be written as a sum of positive squares in 2 ways, for example, as 2327869504 + 10328453641 = 48248^2 + 101629^2 .

It is a cyclic number.

It is not a de Polignac number, because 12656323145 - 2⁴ = 12656323129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12656323099 and 12656323108.

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, 1265632310 + ... + 1265632319.

It is an arithmetic number, because the mean of its divisors is an integer number (3796896945).

Almost surely, 2^12656323145 is an apocalyptic number.

It is an amenable number.

12656323145 is a deficient number, since it is larger than the sum of its proper divisors (2531264635).

12656323145 is an equidigital number, since it uses as much as digits as its factorization.

12656323145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531264634.

The product of its digits is 129600, while the sum is 38.

Adding to 12656323145 its reverse (54132365621), we get a palindrome (66788688766).

The spelling of 12656323145 in words is "twelve billion, six hundred fifty-six million, three hundred twenty-three thousand, one hundred forty-five".