Because that is one of the lives that many people choose in life. And if you ever follow to choose that life then you should know some of the consequences about it if you are going to go thru life...
Yes - there is an infinite number of such numbers. Just take the counting numbers (1,2,3,4, etc...) and put them to the power of 6 (i.e. multiply it by itself 6 times). The sequence of such numbers...