6611 has 4 divisors (see below), whose sum is σ = 7224. Its totient is φ = 6000.

The previous prime is 6607. The next prime is 6619. The reversal of 6611 is 1166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6611 - 2² = 6607 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6619) 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, 290 + ... + 311.

It is an arithmetic number, because the mean of its divisors is an integer number (1806).

2⁶⁶¹¹ is an apocalyptic number.

6611 is a deficient number, since it is larger than the sum of its proper divisors (613).

6611 is a wasteful number, since it uses less digits than its factorization.

6611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612.

The product of its digits is 36, while the sum is 14.

The square root of 6611 is about 81.3080561814. The cubic root of 6611 is about 18.7681897555.

Adding to 6611 its reverse (1166), we get a palindrome (7777).

Subtracting from 6611 its reverse (1166), we obtain a palindrome (5445).

It can be divided in two parts, 66 and 11, that added together give a palindrome (77).

The spelling of 6611 in words is "six thousand, six hundred eleven".