Expatrio. 1 hour ago. Updated. If you have previously been in Germany and were working, you were probably given a Social Security number 'Sozialversicherungsnummer'. This is mandatory and is provided by the German Pension Office. It is necessary to be registered in Germany to apply for a German social security number, because the social
What is the social security number in Germany and how do I get one? Much like the Social Security Number in the US and the National Insurance Number in the UK, the German Sozialversicherungsnummer allows an employer to make the necessary pension contributions for you..