The numeral one billion has nine zeros. This number is equal to one thousand million. In scientific notation, one billion is written as 1x10 to the ninth power.
When trying to get a feel for a number this large, it is helpful to put it in everyday terms. For example, to save $1 billion, a thrifty saver would have to deposit $100 in the bank each day for over 27,000 years. If a person wanted to count to one billion and could spit out numbers at the rate of three per second, it would still take over 95 years to finish.