The word(s) "six" appears 13 time(s) in 12 verse(s) in Quran in Muhammad Pickthal translation.

(11) And he who findeth not (the wherewithal), let him fast for two successive months before they touch one another; and for him who is unable to do so (the penance is) the feeding of sixty needy ones. This, that ye may put trust in Allah and His messenger. Such are the limits (imposed by Allah); and for disbelievers is a painful doom.

(12) Hast thou not seen that Allah knoweth all that is in the heavens and all that is in the earth? There is no secret conference of three but He is their fourth, nor of five but He is their sixth, nor of less than that or more but He is with them wheresoever they may be; and afterward, on the Day of Resurrection, He will inform them of what they did. Lo! Allah is Knower of all things.