6

The number six (6 in decimal form) is the seventh non negative integer/natural number, the sixth positive integer, and the integer preceding seven (7) and following five (5) on the number line. It is also the third factorial number and a highly composite number.

It is relatively easy to picture 6 objects of something in your head, but it is not as easy as picturing 5, 1, 3, 4, 2, or 0 objects.