How many ways are there to choose distinct positive integers $a, b, c, d$ dividing $15^6$ such that none of $a, b, c,$ or $d$ divide each other? (Order does not matter.)

[i]Proposed by Miles Yamner and Andrew Wu[/i]

(Note: wording changed from original to clarify)
1. **Prime Factorization and Representation**:
   We start by noting that \( 15^6 = 3^6 \cdot 5^6 \). Each divisor of \( 15^6 \) can be written in the form \( 3^x \cdot 5^y \) where \( 0 \leq x \leq 6 \) and \( 0 \leq y \leq 6 \).

2. **Distinct Exponents**:
   We need to choose four distinct positive integers \( a, b, c, d \) such that none of them divide each other. This implies that the exponents \( x_i \) and \( y_i \) in the representations \( a = 3^{x_1}5^{y_1} \), \( b = 3^{x_2}5^{y_2} \), \( c = 3^{x_3}5^{y_3} \), and \( d = 3^{x_4}5^{y_4} \) must all be distinct. If any two \( x_i \) or \( y_i \) are equal, one number would divide the other, violating the condition.

3. **Choosing Distinct Exponents**:
   We need to choose 4 distinct values for \( x \) and 4 distinct values for \( y \) from the set \(\{0, 1, 2, 3, 4, 5, 6\}\). The number of ways to choose 4 distinct values from 7 is given by the binomial coefficient:
   \[
   \binom{7}{4}
   \]
   Since we need to choose 4 distinct values for both \( x \) and \( y \), the total number of ways to choose these values is:
   \[
   \left( \binom{7}{4} \right)^2
   \]

4. **Ensuring No Divisibility**:
   Given the chosen values, we need to ensure that none of the numbers divide each other. To do this, we can assume without loss of generality (WLOG) that \( x_1 < x_2 < x_3 < x_4 \). This ordering of \( x \)-values forces the \( y \)-values to be in strictly decreasing order \( y_1 > y_2 > y_3 > y_4 \) to ensure that none of the numbers divide each other.

5. **Calculating the Number of Ways**:
   The number of ways to choose 4 distinct values from 7 is:
   \[
   \binom{7}{4} = 35
   \]
   Therefore, the total number of ways to choose the \( x \)-values and \( y \)-values is:
   \[
   \left( \binom{7}{4} \right)^2 = 35^2 = 1225
   \]

6. **Conclusion**:
   Since the ordering of \( x \)-values uniquely determines the ordering of \( y \)-values, there is exactly 1 way to arrange the \( y \)-values for each choice of \( x \)-values.

Thus, the total number of ways to choose the distinct positive integers \( a, b, c, d \) such that none of them divide each other is:
\[
\boxed{1225}
\]