Let $a_1,a_2,\dots, a_{17}$ be a permutation of $1,2,\dots, 17$ such that $(a_1-a_2)(a_2-a_3)\dots(a_{17}-a_1)=n^{17}$ .Find the maximum possible value of $n$ .
1. **Understanding the problem**: We need to find the maximum possible value of \( n \) such that the product \((a_1 - a_2)(a_2 - a_3) \cdots (a_{17} - a_1) = n^{17}\), where \(a_1, a_2, \ldots, a_{17}\) is a permutation of \(1, 2, \ldots, 17\).

2. **Initial observation**: Since \(a_1, a_2, \ldots, a_{17}\) is a permutation of \(1, 2, \ldots, 17\), each \(a_i\) is distinct. Therefore, each difference \(a_i - a_{i+1}\) is non-zero.

3. **Absolute differences**: Define \(\left| a_i - a_{i+1} \right| = x_i - y_i\), where \(x_i = \max\{a_i, a_{i+1}\}\) and \(y_i = \min\{a_i, a_{i+1}\}\). Each \(a_k\) can appear at most twice among the numbers \(x_1, x_2, \ldots, x_{17}\) and at most twice among the numbers \(y_1, y_2, \ldots, y_{17}\).

4. **Sum of differences**: The sum of the maximum values minus the sum of the minimum values is:
   \[
   \sum x_i - \sum y_i \leq \left[ 2(17 + 16 + \cdots + 10) + 9 \right] - \left[ 2(1 + 2 + \cdots + 8) + 9 \right]
   \]
   Calculating the sums:
   \[
   17 + 16 + \cdots + 10 = \sum_{k=10}^{17} k = \frac{8(17 + 10)}{2} = 108
   \]
   \[
   1 + 2 + \cdots + 8 = \sum_{k=1}^{8} k = \frac{8(8 + 1)}{2} = 36
   \]
   Therefore:
   \[
   \sum x_i - \sum y_i \leq 2 \cdot 108 + 9 - 2 \cdot 36 - 9 = 216 + 9 - 72 - 9 = 144
   \]

5. **Inequality of means**: Using the inequality of means, we have:
   \[
   n \leq \left| n \right| = \sqrt[17]{\prod_{i=1}^{17} \left| a_i - a_{i+1} \right|} \leq \frac{\sum x_i - \sum y_i}{17} \leq \frac{144}{17} \approx 8.47
   \]
   Therefore, \(n \leq 8\).

6. **Checking \(n = 8\)**: If \(n = 8\), then:
   \[
   (a_1 - a_2)(a_2 - a_3) \cdots (a_{17} - a_1) = 8^{17}
   \]
   All 17 factors cannot be multiples of 8, otherwise all 17 \(a_1, a_2, \ldots, a_{17}\) numbers would have the same parity, which is impossible. Therefore, at least one of the 17 factors is a multiple of 16. This is only possible if the numbers in that factor are 1 and 17. Of the remaining 16 factors, only 9 can be multiples of 8:
   \[
   (17, 9), (16, 8), (15, 7), (14, 6), (13, 5), (12, 4), (11, 3), (10, 2), (9, 1)
   \]
   Therefore:
   \[
   51 = 3 \cdot 17 = v_2 \left( \prod_{i=1}^{17} (a_i - a_{i+1}) \right) \leq 4 + 9 \cdot 3 + 7 \cdot 2 = 45
   \]
   which is false. This means that \(n \leq 6\).

7. **Example for \(n = 6\)**: The example for \(n = 6\) is:
   \[
   (17 - 8)(8 - 16)(16 - 7)(7 - 15)(15 - 6)(6 - 14)(14 - 5)(5 - 13)(13 - 4)(4 - 2)(2 - 11)(11 - 10)(10 - 1)(1 - 3)(3 - 12)(12 - 9)(9 - 17) = 6^{17}
   \]

The final answer is \( \boxed{ 6 } \).