12656323129 has 2 divisors, whose sum is σ = 12656323130. Its totient is φ = 12656323128.

The previous prime is 12656323123. The next prime is 12656323151. The reversal of 12656323129 is 92132365621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11956985104 + 699338025 = 109348^2 + 26445^2 .

It is a cyclic number.

It is not a de Polignac number, because 12656323129 - 2¹¹ = 12656321081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12656323091 and 12656323100.

It is not a weakly prime, because it can be changed into another prime (12656323123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328161564 + 6328161565.

It is an arithmetic number, because the mean of its divisors is an integer number (6328161565).

Almost surely, 2^12656323129 is an apocalyptic number.

It is an amenable number.

12656323129 is a deficient number, since it is larger than the sum of its proper divisors (1).

12656323129 is an equidigital number, since it uses as much as digits as its factorization.

12656323129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The spelling of 12656323129 in words is "twelve billion, six hundred fifty-six million, three hundred twenty-three thousand, one hundred twenty-nine".