I don't know if it has a VAT number...
However, if you want to search, the novibet website is owned by Gamart Limited, a company incorporated in Malta, company registration number C95282 and registered office at MWH Building, Office N.1, Oratory Street, Naxxar, NXR 2504, Malta.
The other way is to contact EEEP or ask them in the Novibet chat.