1 googol = 10

^{100}1 googolplex = 10^{googol}= 10^{10100}(The "Google" website name was inspired by "Googol".)
111 111 111 × 111 111 111
=
12345678 9 87654321

**Pi**(3.14159...) is a number that cannot be written as a fraction. Submitted by: Tiff - Witherbee, United States

The opposite sides of a dice cube always add up to

**seven**. Submitted by: Ramesh - Pune, India**21978**when multiplied by 4 is the same number with digits in reverse order: 21978 × 4 = 87912

If you add up the numbers

**1-100**consecutively (1+2+3+4+5...) the total is**5050**.The billionth digit of

**Pi**is 9.1 and 2 are the only numbers where they are the values of the numbers of factors they have.

2 and 5 are the only

**prime numbers**that end in 2 or 5.The largest known

**prime number**(so far) is 17,425,170 digits long. Submitted by: MathguyThe digits to the right of the

**Pi**'s (3.141...) decimal point can keep going forever, and there is no pattern to these digits at all.