6635 has 4 divisors (see below), whose sum is σ = 7968. Its totient is φ = 5304.

The previous prime is 6619. The next prime is 6637. The reversal of 6635 is 5366.

6635 = T₄₄ + T₄₅ + ... + T₄₉.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5366 = 2 ⋅2683.

It is a cyclic number.

It is not a de Polignac number, because 6635 - 2⁴ = 6619 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (6637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (1992).

2⁶⁶³⁵ is an apocalyptic number.

6635 is a deficient number, since it is larger than the sum of its proper divisors (1333).

6635 is a wasteful number, since it uses less digits than its factorization.

6635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 540, while the sum is 20.

The square root of 6635 is about 81.4555093287. The cubic root of 6635 is about 18.7908737960.

It can be divided in two parts, 66 and 35, that added together give a palindrome (101).

The spelling of 6635 in words is "six thousand, six hundred thirty-five".