In only a few more years, by December, 21, 2012, that year’s Winter Solstice, the Mayan Calendar (Long Count) will be completed. See “The How And Why Of The Mayan End Date In 2012 A.D.” by John Major Jenkins. It has been keeping track for the last 5125.36 years, since August 11, 3114 B.C. From the accuracy of the Calendar, myths of the end of the world with the end of the calendar have emerged. So the next 5 years will be quite interesting.
The site Mayan Numbers is the reference for Mayan numbers and their names.
There is a Mayan to Arabic Number converter located in The Mayan Astronomy Page.
Some information about the history of Mayan numbers is given in Mayan Mathematics page
A general introduction to Mayan numerals is located in Mayan Numerals.
It is fascinating to “try on” the various (obscure) number systems and other representations of the digits 1-9 while playing a Sudoku that is not difficult but not easy either.