138655808129 has 2 divisors, whose sum is σ = 138655808130. Its totient is φ = 138655808128.

The previous prime is 138655808117. The next prime is 138655808141. The reversal of 138655808129 is 921808556831.

It is a balanced prime because it is at equal distance from previous prime (138655808117) and next prime (138655808141).

It can be written as a sum of positive squares in only one way, i.e., 109791497104 + 28864311025 = 331348^2 + 169895^2 .

It is a cyclic number.

It is not a de Polignac number, because 138655808129 - 2⁴ = 138655808113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138655808189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69327904064 + 69327904065.

It is an arithmetic number, because the mean of its divisors is an integer number (69327904065).

Almost surely, 2^138655808129 is an apocalyptic number.

It is an amenable number.

138655808129 is a deficient number, since it is larger than the sum of its proper divisors (1).

138655808129 is an equidigital number, since it uses as much as digits as its factorization.

138655808129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4147200, while the sum is 56.

The spelling of 138655808129 in words is "one hundred thirty-eight billion, six hundred fifty-five million, eight hundred eight thousand, one hundred twenty-nine".