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# big_factors() is my sub finding all the primes of a number.
my @result = big_factors(600851475143);
say max @result;

Can't call method "can" on unblessed reference at 
C:/Languages/Perl/perl/lib/Math/BigInt.pm line 2693.

$VAR1 = [
          [],
...
                   'sign' => '+'
                 }, 'Math::BigInt' )
        ];