129705556213 has 2 divisors, whose sum is σ = 129705556214. Its totient is φ = 129705556212.

The previous prime is 129705556187. The next prime is 129705556229. The reversal of 129705556213 is 312655507921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72652889764 + 57052666449 = 269542^2 + 238857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129705556213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129705556613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64852778106 + 64852778107.

It is an arithmetic number, because the mean of its divisors is an integer number (64852778107).

Almost surely, 2^129705556213 is an apocalyptic number.

It is an amenable number.

129705556213 is a deficient number, since it is larger than the sum of its proper divisors (1).

129705556213 is an equidigital number, since it uses as much as digits as its factorization.

129705556213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 46.

The spelling of 129705556213 in words is "one hundred twenty-nine billion, seven hundred five million, five hundred fifty-six thousand, two hundred thirteen".