3. (5 points) If the product of 6 consecutive odd numbers is 135135, then the sum of these 6 numbers is $\qquad$
【Analysis】First, decompose 135135 into prime factors, then according to the arrangement rule of consecutive odd numbers, the difference between two adjacent odd numbers is 2. Then, adjust and calculate the prime factors of 135135 according to the problem.
【Solution】Solution: $135135=3 \times 3 \times 3 \times 5 \times 11 \times 7 \times 13$;
Since it is 6 consecutive odd numbers, in addition to the odd numbers $3,5,7,11,13$, there is also: $3 \times 3=9$,
So the 6 consecutive odd numbers are: $3,5,7,9,11,13$,
The sum of the 6 consecutive odd numbers is: $3+5+7+9+11+13=48$;
Therefore, the answer is: 48.