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How many digits is the social security card number?

The social security number is 18 digits.

The social security number is a number used to identify an individual, which consists of 18 digits and is formulated by the China municipal government. Social security number is mainly used to identify individuals, including ID number, citizenship number, social security number and social insurance number. Managed by China Social Insurance Bureau, each insured person has a unique social security number, which can be used to identify the identity of the insured person.