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The predecessor of 1 is 0. If you define "natural numbers" as starting at 1, then 1 has no predecessor. (Natural numbers can be defined either to include, or to exclude, zero.)
9999
Every integer has a predecessor and a succesor. If you mean NON-NEGATIVE whole numbers, the answer would be zero.
That depends on how you're counting. A predecessor is a thing that has been followed or replaced by another. Counting by ones, the predecessor is 10799. Counting by hundreds, the predecessor is 10700. Counting down by hundreds, the predecessor is 10900.
Atomic Energy Commission