A number is between $500$ and $1000$ and has a remainder of $6$ when divided by $25$ and a remainder of $7$ when divided by $9$. Find the only odd number to satisfy these requirements.
1. **Identify the congruences:**
   We are given two congruences:
   \[
   x \equiv 6 \pmod{25}
   \]
   \[
   x \equiv 7 \pmod{9}
   \]

2. **Apply the Chinese Remainder Theorem (CRT):**
   The Chinese Remainder Theorem states that if we have two congruences with coprime moduli, there exists a unique solution modulo the product of the moduli. Here, the moduli are 25 and 9, which are coprime.

3. **Express the solution in terms of one of the moduli:**
   Let \( x = 25k + 6 \) for some integer \( k \). Substitute this into the second congruence:
   \[
   25k + 6 \equiv 7 \pmod{9}
   \]
   Simplify the congruence:
   \[
   25k + 6 \equiv 7 \pmod{9}
   \]
   Since \( 25 \equiv 7 \pmod{9} \), we can rewrite the congruence as:
   \[
   7k + 6 \equiv 7 \pmod{9}
   \]
   Subtract 6 from both sides:
   \[
   7k \equiv 1 \pmod{9}
   \]

4. **Solve for \( k \):**
   We need to find the multiplicative inverse of 7 modulo 9. The multiplicative inverse of 7 modulo 9 is a number \( k \) such that:
   \[
   7k \equiv 1 \pmod{9}
   \]
   By trial, we find that \( k = 4 \) works because:
   \[
   7 \cdot 4 = 28 \equiv 1 \pmod{9}
   \]
   Therefore, \( k \equiv 4 \pmod{9} \).

5. **Substitute back to find \( x \):**
   Since \( k = 9m + 4 \) for some integer \( m \), we substitute back:
   \[
   x = 25k + 6 = 25(9m + 4) + 6 = 225m + 100 + 6 = 225m + 106
   \]
   Thus, the general solution is:
   \[
   x \equiv 106 \pmod{225}
   \]

6. **Find the specific solution within the given range:**
   We need \( x \) to be between 500 and 1000. We write:
   \[
   x = 225n + 106
   \]
   for some integer \( n \). We need:
   \[
   500 \leq 225n + 106 \leq 1000
   \]
   Subtract 106 from all parts:
   \[
   394 \leq 225n \leq 894
   \]
   Divide by 225:
   \[
   \frac{394}{225} \leq n \leq \frac{894}{225}
   \]
   Simplify:
   \[
   1.75 \leq n \leq 3.97
   \]
   Since \( n \) must be an integer, \( n = 2 \) or \( n = 3 \).

7. **Check the values of \( n \):**
   For \( n = 2 \):
   \[
   x = 225 \cdot 2 + 106 = 450 + 106 = 556
   \]
   For \( n = 3 \):
   \[
   x = 225 \cdot 3 + 106 = 675 + 106 = 781
   \]

8. **Verify the odd number condition:**
   Among 556 and 781, only 781 is odd.

The final answer is \(\boxed{781}\).