It doesn't matter how you bet. The payoff odds on an American roulette wheel are 35 to 1, as though there are only 36 slots and there is a 1 chance in 36 of hitting your number. But, there are actually 38 slots on the wheel, 1 thru 36, plus 0 and 00.
If you place a bet on the number 0 in roulette and the ball lands on that number, you win. In most casinos, the payout for a winning bet on 0 is 35 to 1, meaning you receive 35 times your original bet. This can result in a significant win if you've placed a substantial bet on 0.