As the vast majority of pipe organs are custom designed there is no one, definitive answer. A small, hand pumped, table top organ ("or Portative") might have as few as 25 pipes - or two octaves. The...
The standard organ manual keyboard has 61 keys and the pedal keyboard has 32 keys. Most pipe organs have at least two manual keyboards and large organs have four or more. The number of keys has grown...
The number can vary greatly ... anywhere from a couple dozen to thousands upon thousands in any one pipe organ installation. The largest 100% playable pipe organ in the world, the Wanamaker organ in...
IOW? A rank can have anything from 49 to 97 pipes depending on whether it is a straight or unit rank. There are even some short ranks that have fewer than 49 pipes. Ranks in the pedal divisions will...