How can anyone possibly ever answer that question?
People have been disputing how many people have ever lived on the earth for decades. Some anthropologists have thrown out numbers as high as 70billion-120billion, although other scientists have admittedly said the number is probably around 7-10B.
How many people to calculate how many people have ever lived?
That's just a log2( X ) number of bits would be needed. As the author of the blog says, 6000 billion people could be written in just 43 bits.