Based on picking random numbers.
Assuming 300m tickets it's 37% (and 26% multiple winners)
Assuming 400m tickets it's 27% (and 38% multiple winners)
Assuming 500m tickets it's 19% (and 49% multiple winners)
Assuming 600m tickets it's 14% (and 59% multiple winners)
Assuming 700m tickets it's 10% (and 67% multiple winners)
I'd guess roughly 5-600m tickets will be sold, so it's pretty likely that they'll be multiple winners and very unlikely that no one will win