Question

What do you mean by $10$ digit number?

Answer 1

$10$-digit number.

• A $10$-digit number has $10$ digits and the first digit should not be equal to zero.
• The first digit should be a number from $1$ to $9$.
• The smallest $10$ digit number is $1,000,000,000$. This is called one billion.
• The largest $10$ digit number is $9,999,999,999$.