6669 has 16 divisors (see below), whose sum is σ = 11200. Its totient is φ = 3888.
The previous prime is 6661. The next prime is 6673. The reversal of 6669 is 9666.
It is not a de Polignac number, because 6669 - 23 = 6661 is a prime.
It is a super-2 number, since 2×66692 = 88951122, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a d-powerful number, because it can be written as 62 + 62 + 62 + 94 .
It is a Duffinian number.
It is a Curzon number.
6669 is a lucky number.
It is a plaindrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6661) 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, 342 + ... + 360.
It is an arithmetic number, because the mean of its divisors is an integer number (700).
It is an amenable number.
6669 is a deficient number, since it is larger than the sum of its proper divisors (4531).
6669 is a wasteful number, since it uses less digits than its factorization.
6669 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 41 (or 35 counting only the distinct ones).
The product of its digits is 1944, while the sum is 27.
The square root of 6669 is about 81.6639455329. The cubic root of 6669 is about 18.8229160722.
It can be divided in two parts, 66 and 69, that multiplied together give a palindrome (4554).
The spelling of 6669 in words is "six thousand, six hundred sixty-nine".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.074 sec. • engine limits •