6656217 has 8 divisors (see below), whose sum is σ = 9042624. Its totient is φ = 4353648.

The previous prime is 6656201. The next prime is 6656239. The reversal of 6656217 is 7126566.

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

It is not a de Polignac number, because 6656217 - 2⁴ = 6656201 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6656257) 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, 20773 + ... + 21090.

It is an arithmetic number, because the mean of its divisors is an integer number (1130328).

Almost surely, 2^6656217 is an apocalyptic number.

It is an amenable number.

6656217 is a deficient number, since it is larger than the sum of its proper divisors (2386407).

6656217 is a wasteful number, since it uses less digits than its factorization.

6656217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41919.

The product of its digits is 15120, while the sum is 33.

The square root of 6656217 is about 2579.9645346400. The cubic root of 6656217 is about 188.1088192247.

The spelling of 6656217 in words is "six million, six hundred fifty-six thousand, two hundred seventeen".