The decimal 80 Number in the Braille Alphabet is
Número = Number sign. Means that it opens a number instead of a sequence of letters.
All natural divisors of 80 are:
1, 2, 4, 5, 8, 10, 16, 20, 40, 80
And that is the number factored 80 = 2 x 2 x 2 x 2 x 5 (it is not prime)