To find out how much each person needs to pay, you can divide the total bill by the number of people. In this case, there are Billy and five friends, which total to 6 people.
The calculation is as follows:
\[ \text{Amount per person} = \frac{\text{Total bill}}{\text{Number of people}} = \frac{102}{6} = 17 \]
Therefore, each person has to pay $17 towards the bill.