6655689 has 20 divisors (see below), whose sum is σ = 10036224. Its totient is φ = 4395384.

The previous prime is 6655673. The next prime is 6655723. The reversal of 6655689 is 9865566.

It is not a de Polignac number, because 6655689 - 2⁴ = 6655673 is a prime.

6655689 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6655639) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9964 + ... + 10610.

Almost surely, 2^6655689 is an apocalyptic number.

It is an amenable number.

6655689 is a deficient number, since it is larger than the sum of its proper divisors (3380535).

6655689 is a wasteful number, since it uses less digits than its factorization.

6655689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 777 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 6655689 is about 2579.8622056226. The cubic root of 6655689 is about 188.1038452241.

It can be divided in two parts, 66 and 55689, that added together give a palindrome (55755).

The spelling of 6655689 in words is "six million, six hundred fifty-five thousand, six hundred eighty-nine".