How many gears does a Toyota Prius have?

Answer 1

While there are "gears" in a Prius, in the reference that most people would be asking this question, there are actually NONE. The Prius(all 3.5 generations as of 2010) uses a planetary differential with the engine at one point and a Motor/Generator(MG) at another point and another MG which is attached to the wheels at another. The MG's can each also supply power or drag in either direction.

What this means is that there are no clutches to disconnect any point, but the Prius can be completely stopped or moving at speed while the engine is completely shut off or spinning. It simply adjusts the balance by way of speed, direction and drag of the 2 MG's through the planetary differential.