The number 61 is classified as a prime number, meaning it is greater than 1 and has no positive divisors other than 1 and itself. This makes it unique in the realm of numbers, as it cannot be formed by multiplying two smaller natural numbers. In the context of mathematics, prime numbers like 61 play a crucial role in number theory and are fundamental in various applications, including cryptography. The next prime number after 61 is 67, while the previous one is 59.