* Definition of "teacher courses": This could range from single courses on teaching methods to full-fledged teacher certification programs, graduate degrees in education, or even just pedagogical components within other degrees (e.g., a course on effective communication within a journalism program).
* Geographic location: The density of colleges and universities offering education programs differs significantly across countries.
* Level of institution: Community colleges, four-year colleges, and universities all offer varying levels of teacher training.
To get a specific number would require a massive global survey of all educational institutions. While you could find statistics on the number of teacher training programs in specific countries or regions, a precise worldwide count is not readily available.