6656557 has 8 divisors (see below), whose sum is σ = 6811200. Its totient is φ = 6503424.

The previous prime is 6656549. The next prime is 6656561. The reversal of 6656557 is 7556566.

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

It is a cyclic number.

It is not a de Polignac number, because 6656557 - 2³ = 6656549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14944 + ... + 15382.

It is an arithmetic number, because the mean of its divisors is an integer number (851400).

Almost surely, 2^6656557 is an apocalyptic number.

It is an amenable number.

6656557 is a deficient number, since it is larger than the sum of its proper divisors (154643).

6656557 is a wasteful number, since it uses less digits than its factorization.

6656557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755.

The product of its digits is 189000, while the sum is 40.

The square root of 6656557 is about 2580.0304261772. The cubic root of 6656557 is about 188.1120220405.

Subtracting 6656557 from its reverse (7556566), we obtain a palindrome (900009).

The spelling of 6656557 in words is "six million, six hundred fifty-six thousand, five hundred fifty-seven".