6555 has 16 divisors (see below), whose sum is σ = 11520. Its totient is φ = 3168.

The previous prime is 6553. The next prime is 6563. The reversal of 6555 is 5556.

6555 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

6555 is a nontrivial binomial coefficient, being equal to C(115, 2).

It is not a de Polignac number, because 6555 - 2¹ = 6553 is a prime.

Its product of digits (750) is a multiple of the sum of its prime divisors (50).

It is a plaindrome in base 16.

It is a nialpdrome in base 3, base 9 and base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 6555.

It is not an unprimeable number, because it can be changed into a prime (6551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274 + ... + 296.

It is an arithmetic number, because the mean of its divisors is an integer number (720).

2⁶⁵⁵⁵ is an apocalyptic number.

6555 is the 114-th triangular number.

6555 is a deficient number, since it is larger than the sum of its proper divisors (4965).

6555 is a wasteful number, since it uses less digits than its factorization.

6555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50.

The product of its digits is 750, while the sum is 21.

The square root of 6555 is about 80.9629544915. The cubic root of 6555 is about 18.7150459899.

Subtracting from 6555 its reverse (5556), we obtain a palindrome (999).

It can be divided in two parts, 65 and 55, that added together give a triangular number (120 = T₁₅).

The spelling of 6555 in words is "six thousand, five hundred fifty-five".