Test whether 6800900181 is divisible by 111 or not.

Explanation

To determine whether the number 6800900181 is divisible by 111, we can follow these steps:

### Step 1: Group the digits in threes from the right
We start by grouping the digits of the number 6800900181 into sets of three, starting from the right. If there are not enough digits to form a complete group of three, we can add leading zeros.

- The number is: 6800900181
- Grouping from the right: 6 800 900 181 (we can add two zeros to the left of 6 to make it a group of three: 006)

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