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Where is the unit social security number generally written?

This number is usually written on the back of the personal social security card.

The social security number of the company is a digital coding system, which is used to identify the unique identity of the company in the social insurance system. It is an important certificate for the unit to handle social insurance related business. The total number of codes is 18, which is the code on the social security registration certificate issued to the enterprise by the social security center after the enterprise completes the social security registration.