In detail

A number with letters

A number with letters

What is the smallest number whose number of digits is equal to the number of characters (including blank spaces) needed to write it with letters?

An erroneous example would be: 10.002 (5 digits) - “Ten thousand two” (12 characters).

Solution

“One billion one” has 13 characters and 1,000,000,000,001 has 13 digits