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 techniques reduced its power to 56 Megatonns.