five thousand five hundred and thirty-two
Both are 8-pin dual-op amps, and a single chip can handle signals from two channels. 4558 is commonly used in low-grade power amplifier circuits, while devices using 5532 are relatively more high-end. But now the 5532 is an outdated model, and there are many fakes. The current opamPs better than 5532 are much more selective, so there is no need to pay attention to this chip.