5. (10 points) Among all the factors of the four-digit number Shuangcheng Shuangcheng, 3 are prime numbers, and the other 39 are not prime. Then, 
the four-digit number Shuangcheng Shuangcheng has $\qquad$ factors.
【Solution】Solution: First, according to the sum of the digits in odd and even positions being equal, it must be a multiple of 11. The total number of factors is $3+39=42$ (individuals), decomposing 42 into the product of 3 numbers $42=2 \times 3 \times 7$.
$\overline{\text { double become become double }}=a \times b^{2} \times c^{6}$.
If it is $11 \times 5^{2} \times 2^{6}=17600$ (not a four-digit number, does not meet the condition). Let's check if the smallest number is $\overline{\text { double become become double }}=11 \times 3^{2} \times 2^{6}=6336$.

Become double double become $=3663=11 \times 37 \times 3^{2}$. The number of factors is $2 \times 2 \times 3=12$ (individuals).
Therefore, the answer is: 12 individuals.