6655989 has 4 divisors (see below), whose sum is σ = 8874656. Its totient is φ = 4437324.

The previous prime is 6655951. The next prime is 6655997. The reversal of 6655989 is 9895566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-6655989 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6655919) 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, 1109329 + ... + 1109334.

It is an arithmetic number, because the mean of its divisors is an integer number (2218664).

Almost surely, 2^6655989 is an apocalyptic number.

It is an amenable number.

6655989 is a deficient number, since it is larger than the sum of its proper divisors (2218667).

6655989 is a wasteful number, since it uses less digits than its factorization.

6655989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218666.

The product of its digits is 583200, while the sum is 48.

The square root of 6655989 is about 2579.9203476077. The cubic root of 6655989 is about 188.1066713931.

The spelling of 6655989 in words is "six million, six hundred fifty-five thousand, nine hundred eighty-nine".