According to the relevant information of Cai Xi. The euro is the unified currency of EU countries. At present, there are seven denominations, namely 5, 10, 20, 50, 100, 200,500, so the maximum denomination of the euro is 500. The euro of 500 denominations is not issued in some countries and regions, but it is still legal tender.

The euro is the official currency of 23 countries and regions, and the exchange rates of official currencies of 28 countries and regions are linked to the euro.