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.)
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The number that is one less than 7000, that is, 7000 - 1.
There are different schools of thought on this, but I maintain that whole numbers start with zero.
If x is the natural number, 1/x is the reciprocal.
1
1 820 199.