This is a ceramic capacitor with part number CAP CER 56PF 500V C0G/NP0 1825. It has a capacitance of 56 pF and operates at ±5% tolerance within a voltage range of 500V. The capacitor type is C0G, also known as NP0, which indicates it has a stable and predictable temperature coefficient. Its metric size is 4564, equivalent to the 1825 designation.