There are several synonyms for the phrase "hot number," which is often used in the context of gambling or lottery. One such synonym is "lucky number," which suggests that the number in question is fortunate and likely to result in a positive outcome. Another term that can be used instead of "hot number" is "winning number," which implies that the number has a high probability of being drawn or selected. "Special number" is also an alternative, as it suggests that the number holds significance or importance in some way. Ultimately, the choice of synonym will depend on the context in which the phrase is being used.