Operational Amplifier diagram
The AD8662 is, according to Analog Devices, a dual op-amp - there are two op-amps in the package.  The two op-amps share the power and ground pins but are otherwise independent. The AD8664 is a quad op-amp - four op-amps in one package.

There are many dual (two op-amps) and quad (four op-amps) types.  Many analog comparators and simple logic gates also come two or four-to-a-package, sharing power and ground pins.