6655999 has 8 divisors (see below), whose sum is σ = 7769088. Its totient is φ = 5583480.

The previous prime is 6655997. The next prime is 6656003. The reversal of 6655999 is 9995566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6655999 - 2¹ = 6655997 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6655997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9787 + ... + 10444.

It is an arithmetic number, because the mean of its divisors is an integer number (971136).

Almost surely, 2^6655999 is an apocalyptic number.

6655999 is a deficient number, since it is larger than the sum of its proper divisors (1113089).

6655999 is a wasteful number, since it uses less digits than its factorization.

6655999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20285.

The product of its digits is 656100, while the sum is 49.

The square root of 6655999 is about 2579.9222856513. The cubic root of 6655999 is about 188.1067655972.

It can be divided in two parts, 66 and 55999, that added together give a palindrome (56065).

The spelling of 6655999 in words is "six million, six hundred fifty-five thousand, nine hundred ninety-nine".