How to obtain your social security number

Hello,

Thank you very much for the response, I do have some more questions I hope you can help me,
I had an emergency surgery few months ago, while I was working in France from November but my company was not very helpful with me applying for the security sociale,
I received recently the bill from the hospital with the 30 days to pay it, my questions are

-Do I need to pay it or wait for the security sociale or to contact directly the hospital?
-if I don't pay it is there an extra charge as a fine?

and second because of this situation as you understand I will need the public insurance
-how long does it take more or less to received the number and is there a way for emergency situations to receive it faster maybe?

Have a nice day too!!!