2.982000000 is pronounced as (982 million), and 8 is in the position of (10 million), which means (8 million). This number is rewritten as (982 million) in the unit of "1 billion", and the mantissa after "1 billion" is omitted as (65.438+billion).

The smallest number is (0), and the smallest three digits are different from the largest four digits (9899).

The decimal unit of 4.0.79 is (1100), and at least (12 1) such units add up to become the smallest prime number.