This bomb is also called the Father of Bombs. See footage of the explosion here
The explosion had a power of 56.000.000 tonns of TNT (56 Megatonns). The Tsar Bomb was actually designed as a 100 Megaton-Bomb. But as there were problems to detonate a bomb as strong as 100,000,000 tonns of TNT, so the Soviet Union technicians reduced its power to 56 Megatonns.
The bomb was dropped by a Soviet bomber, the Tupolev Tu-95. This was one of the only planes in the world which could carry the bomb. When the bomb exploded, the bomber fell one Kilometer in height from the huge blast wave.