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For positive integers, it is true that the largest factor of any number is itself
It really depends how the numbers are encoded. With two common encodings, the largest numbers are the following:For an unsigned number (only allows storing zero and positive numbers), the largest number is 232 - 1 (approximately 4 billion).For a signed number (allows positive and negative numbers), the largest number is 231 - 1 (approximately 2 billion).
Negative infinity is the LEAST number. The smallest number is 'zero(0)' for Nothing. Positive infinity is the GREATEST number .
The set of positive integers is {1, 2, 3, 4, 5, ...}. Because the values approach positive infinity there is no largest positive integer. If you pick any positive integer, you can always create a larger one by simply adding 1 to it. So there can be no largest positive integer.
Not necessarily. A negative number plus a positive number can be negative, zero or positive.