Why does the number become a scientific notation when it is too long?

Why does the number become scientific notation when the numbers are too long?
The numeric value is taken out of the library, because the value is a bit large (50 numbers), after the removal of the science is immediately counted, how to avoid this problem?

------Solution--------------------
50 numbers, really big enough.
Stored words you can use strings, because MySQL does not have the ability to handle 50-digit data types.
Naturally there is no such high-precision data type in PHP, you can use the GMP series function or the BC Math series function to handle it.
------Solution--------------------
Well, it is estimated that your max (model_id+0) is sometimes inaccurate ...

If you have to do this, you can
Select model_id from * * *
ORDER by Max (MODEL_ID+0) desc
Limit 1;

Depending on the circumstances of your model_id, or this can be
Select model_id from * * *
Order by Length (MODEL_ID) desc, model_id desc
Limit 1;

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