1 === mul ===

     2 4611686014132420600

     3 36893488130239234000

     4 === self_mul ===

     5 4611686014132420600

     6 36893488130239234000

     7 === sub ===

     8 4294967294

     9 18446744073709552000

    10 === self_sub ===

    11 4294967294

    12 18446744073709552000

    13 === add ===

    14 4294967294

    15 18446744073709552000

    16 === self_add ===

    17 4294967294

    18 18446744073709552000