129998818183217 has 2 divisors, whose sum is σ = 129998818183218. Its totient is φ = 129998818183216.

The previous prime is 129998818183159. The next prime is 129998818183231. The reversal of 129998818183217 is 712381818899921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127663694954896 + 2335123228321 = 11298836^2 + 1528111^2 .

It is a cyclic number.

It is not a de Polignac number, because 129998818183217 - 2¹⁰ = 129998818182193 is a prime.

It is a super-2 number, since 2×129998818183217² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129998811183217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64999409091608 + 64999409091609.

It is an arithmetic number, because the mean of its divisors is an integer number (64999409091609).

Almost surely, 2^{129998818183217} is an apocalyptic number.

It is an amenable number.

129998818183217 is a deficient number, since it is larger than the sum of its proper divisors (1).

129998818183217 is an equidigital number, since it uses as much as digits as its factorization.

129998818183217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250822656, while the sum is 77.

The spelling of 129998818183217 in words is "one hundred twenty-nine trillion, nine hundred ninety-eight billion, eight hundred eighteen million, one hundred eighty-three thousand, two hundred seventeen".