MOD() function - incorrect output

The following bit of SQL uses the mod() function to determine modulus 2 of two large numbers
13:37:20 SQL>set echo on
13:37:24 SQL>@mod_test
13:37:25 SQL>
13:37:25 SQL>
13:37:25 SQL>
13:37:25 SQL>select mod(power(2,127)-1,2) from dual
13:37:25 2 /
MOD(POWER(2,127)-1,2)
1
1 row selected.
13:37:25 SQL>
13:37:25 SQL>select mod(power(2,128)-1,2) from dual
13:37:25 2 /
MOD(POWER(2,128)-1,2)
-1
1 row selected.
13:37:25 SQL>
Notice that mod(power(2,128)-1,2) returns an incorrect answer, while the
answer for mod(power(2,127)-1,2) is correct.
Does someone here know why?
Is it a limit?
Or is it a bug?
Please supply an explanation and/or URL for your answer. :)

Must be due to the fact the scale for a NUMBER can range from -84 to 127, and Floating Point Number Limits are:
Value Binary-Float Binary-Double
Maximum positive finite value 3.40282E+38F 1.79769313486231E+308
Minimum positive finite value 1.17549E-38F 2.22507485850720E-308

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user12130369 wrote:
In a simple sql statement I ran from my test db. For the life of me I cannot see where any division takes place.
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I'm describing below what exactly is required:
The cube has 4 dimensions (Date, Store, Product, Client Product) and one measure (Price). I need a measure to behave same as the MODE function in
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