Numeric error in a function

Hi there!
...got a problem with a Function I wrote... after several iterations the Program stops while executing it with a larger number than before (had values between -1 and 1 before, than I get the value 7167943,57300470185652922197670142674731)
My function looks like that:
function diff_f_act (in# in number) return number is
result# number;
begin
dbms_output.put_line('in:'||in#);
result# := Exp(Nvl(in#,0)*(-1))/((1 + (Exp(Nvl(in#,0)) *(-1)))**2);
return result#;
end diff_f_act;
the error is:
ORA-06502: PL/SQL: numerischer oder Wertefehler
ORA-06512: in "EBFI.NN", Zeile 61
ORA-06512: in "EBFI.NN", Zeile 101
ORA-06512: in "EBFI.NN", Zeile 118
ORA-06512: in "EBFI.NN", Zeile 477
ORA-06512: in "EBFI.NN", Zeile 510
ORA-06512: in Zeile 2
means numeric or value error. Anybody who could help me? Thanks in advance!

the values I'm passing:
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:3198,241219825410765677625466993668376997
in:3200,058908281836871125663159588371504403
in:306391,4153502201384466073629367047496096
1;1;ORA-06502: PL/SQL: numerischer oder Wertefehler
ORA-06512: in "EBFI.NN", Zeile 66
ORA-06512: in "EBFI.NN", Zeile 111
ORA-06512: in "EBFI.NN", Zeile 137
ORA-06512: in "EBFI.NN", Zeile 496
ORA-06512: in "EBFI.NN", Zeile 529
ORA-06512: in Zeile 2
306391,4153502201384466073629367047496096 causes the Problem

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