The Int type is intended to host integer variables of arbitrary size. For example, no digit is lost in the following assignment:
my Int $x = 12389147319583948275874801735817503285431532; say $x;
A special syntax exists for defining integers with an other-than-10 base:
say :16<D0CF11E0>
Also, it is allowable to use the underscore character to separate digits so that big numbers can be read more easily:
my Int $x = 735_817_503_285_431_532;
Of course, when you print the value, all the underscores are gone.
On the Int object, you may call some other handy methods, for example, to convert a number to a character or to check if the integer in hand is prime (yes, is-prime is a built-in method!).
my Int $a = 65; say $a.chr; # A my Int $i = 17; say $i.is-prime; # True say 42.is-prime; # False