Using a standard sticker pattern (each face is a solid colour) there are approximately 6.69 x 101054 combinations or exactly: 66909260871052009626140831457599196711140812269154070729060136529449625780211961895693820570513604163602868942801633627363413148772664738570971988412147490850469267091069898537146037768890069934919884249763818629080668367898685033459370133844075322446474048403397592421266564641031053781182835951043902666703934718275733629773072428119603386280810232743294106725017906015726602505404809355600713515400760343408510054774806467063695824637124911945446317465833055520836975861238244940397333234336971270687092383804133631886114309853819332336282986834777948178464656888802372250927074981140246608824577036094710201099095240641256513217598802423874027822421584587650039125516202912205481540427864199947576722221866866102507350876922115628881880203115212216766503665426445956786264399133302962649600884736000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Gus
According to http://www.reade.com/Particle_Briefings/spec_gra2.html the weight of one cubic foot of hulled rice is 47 lbs, rough weighing in at 36 lbs. There are 29,000 grains of rice per pound, making 1,363,000 per cubic foot. All the people alive today would equate to a 17x17x17 foot box of rice.
1x1x1=1 2x2x2=8 3x3x3=27 4x4x4=64 5x5x5=125 6x6x6=216 7x7x7=343 8x8x8=512 9x9x9=729 10x10x10=1000 11x11x11=1331 12x12x12=1728 13x13x13=2197 14x14x14=2744 15x15x15=3375 16x16x16=4096 17x17x17=4913 18x18x18=5832 19x19x19=6859 20x20x20=8000 21x21x21=9261 use calculator to work out the rest cant be bothered to write out any more LOL :-)
3x3x3 cube look on youtube for the worlds largest rubiks cube. if our talking about the actual cubes the largest I've seen was a 9x9x9 cube