Those who complete (compleat!) the Munros can record this fact and receive the magic number by writing in to The Clerk of The List (See here). Additionally, a list of current compleaters is published annually in the SMC Journal.
Alec Mackenzie - 123
Bidean nam Bian - 1973
Photo c/o Ken Ross who writes:
I suspect that Lily (Munroist 131) and her husband Alec MacKenzie were the first husband and wife couple to complete the Munros. Both Alec and Lily had Pipe tunes composed for and played as they topped out. The piper was a Peter Cromar.