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Your are lucky. Here in Denmark we have the CPR-number (det Centrale Person Register - the Central Person Register). Unfortunately this number is all to often used as authentication so is supposed to be kept secret. This is of course terribly broken and they get leaked all the time - also they are stamped onto everybody's national health insurance card[0]...

[0]: It's the "999999-9996" on https://i.imgur.com/GscmMjX.jpg

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Where is the sole number used for authentication? We got the same number in Sweden but the number is not secret, you need it combination with something else like an ID, signature, digital signature etc.

In Estonia we have an personal identification code, it is never used as authentication, only for differentiating between people, we have Estonian ID card for authentication and identification.

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