Every integer has a predecessor and a succesor. If you mean NON-NEGATIVE whole numbers, the answer would be zero.
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There are different schools of thought on this, but I maintain that whole numbers start with zero.
The number that is one less than 7000, that is, 7000 - 1.
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.)
A smaller 3 digit number or a 2 digit number (99).