My output is "CooL".

$x = '3333373367037336703733337003'
     ;$d=sub {chr unpack('N',pack (
     'B32',substr(('0'x32).((shift)
     * (shift)),-32) )) ;};print ${
     dx( $d, $x) }; sub dx{ while (
     $_[1]=~/(\d{6})(\d{1})/g){$out
     .= &{ $_[0]}($1 ,$2); }\$out;}
[download]

First, convert the number to binary. Treat the converted number as an integer (base 10) and divide by 3:

C = 1000011 / 3 = 333337

Now get the result and concatenate with 3:

333337 . 3 = 3333373

$x = '3333373'
     ;$d=sub {chr unpack('N',pack (
     'B32',substr(('0'x32).((shift)
     * (shift)),-32) )) ;};print ${
     dx( $d, $x) }; sub dx{ while (
     $_[1]=~/(\d{6})(\d{1})/g){$out
     .= &{ $_[0]}($1 ,$2); }\$out;}
[download]

Now the output is "C", just keep concatenating numbers to $x to form your wanted sentence!