No, the natural number 1 does not have a predecessor. This is because all natural numbers are counting numbers and they can only be preceded by their predecessors, which in the case of 1 would be 0. Therefore, the natural number 1 has no predecessor as it cannot go any lower than 0.

The concept of having no immediate predecessor is referred to as an “atomic number”. The atomic number of 1 is the only one in the entire set of natural numbers and it symbolizes the beginning, or origin, of the set. It also indicates that there are no further numbers before it, so it can be seen as a unique element among its peers.

**Which is the greatest whole number?**

The greatest whole number is the natural number 9,999. This number is one less than 10,000 and is the largest counting number that does not include a decimal point or any other form of notation. It is also referred to as a “googolplex” in mathematical terms, which represents an incredibly large quantity of numbers. The number is so large that it is virtually impossible to count up to it, so it is considered the greatest whole number in mathematics.

However, there are many other definitions of “greatest” when it comes to numbers. The largest prime number known as of 2021 is 2⁷⁰³²⁸−1, which surpasses 9,999 by a wide margin. The largest known Mersenne prime is 2²⁶²⁰¹−1, which is even larger than the previous number and exceeds 9,999 by an even greater amount. Therefore, depending on what definition of “greatest” is being used, there are many different numbers that could be considered the greatest whole number.

In conclusion, the natural number 1 does not have a predecessor, and the greatest whole number is commonly accepted to be 9,999. However, depending on which definition of “greatest” is used, there can be much larger numbers than 9,999. No matter which definition is used, the natural number 1 remains unique in that it has no predecessor and serves as the origin of the set of natural numbers.