36(ish) volts might give a little tingle on dry skin, it's unlikely to do any harm though. If your skin is wet, you'll feel it for sure, but it's still not going to kill you. Generally anything under 100 volts is "safe" for contact with dry skin. That doesn't mean you feel nothing, it just means you don't have to worry about dying.
AC or DC it's going to give you a zap, the difference with DC is that because the current doesn't reverse polarity 50 or 60 times a second like AC, the tendency is for muscles to contract and stay contracted until the current is removed, where as AC tends to "throw you off" it. That can be very dangerous if you find your hand wrapped around a high voltage DC bus bar or wire, as you physically may not be able to pull yourself away from it. Again, we're talking about voltages substantially higher than your 36V pack delivers.
The real danger from these batteries is the hot plasma that erupts when a short occurs across the power leads, this can cause severe skin burns and damage your eyes if you're looking at it. This can occur at fairly low voltages, it's more a product of the amperage that a big battery can deliver, which in the case of most ebike batteries is considerable.