Mandela's prison number seems to have morphed from 4664 to 46664

There was a "The 4664 Concert"

Katie says: "I did a Nelson Mandela gig called 4664 which raised the awareness of Aids, and I was asked by Queen the band, who are my heroes, to sing one of their songs Too Much Love Will Kill You, with them http://www.thisislocallondon.com/display.var.597827.0.globetrotter_katie_feels_most_at_home_in_redhill.php

Following the inaugural 4664 concert held in South Africa last November, it has been announced Spain will host a follow-up in August. http://www.undercover.com.au/news/2004/june04/20040628_46664.html

so weird that it is now 46664 and he must back that change:

"46664 is Nelson Mandela’s campaign to help raise Global awareness of AIDS/HIV. 46664 launched last Autumn by Mandela in London aims to highlight the emergency of AIDS/HIV through unique live events and music related initiatives." http://46664.tiscali.com