Being able to count using fingers is more valuable than having one more prime factor.
Let’s go hexadecimal all the way.
Switching from Base 10 to Base 12 would be difficult. Instead we should go back in time and ensure we evolve with 6 fingers on each hand and foot.
https://www.wikihow.com/Multiply-With-Your-Hands
Those techniques can be useful. If you add toes, multiplying numbers up to 20 (like 16x18) is easy.