8 Standard DataTypes 
8.36 UInt64
This Built-in DataType defines a value that is an unsigned integer between 0 and 18 446 744 073 709 551 615 inclusive.
Online versions of OPC UA specifications and information models.
This Built-in DataType defines a value that is an unsigned integer between 0 and 18 446 744 073 709 551 615 inclusive.