6656611 has 4 divisors (see below), whose sum is σ = 7168672. Its totient is φ = 6144552.

The previous prime is 6656603. The next prime is 6656621. The reversal of 6656611 is 1166566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6656611 - 2³ = 6656603 is a prime.

It is a Duffinian number.

6656611 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6656621) 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 3 ways as a sum of consecutive naturals, for example, 256011 + ... + 256036.

It is an arithmetic number, because the mean of its divisors is an integer number (1792168).

Almost surely, 2^6656611 is an apocalyptic number.

6656611 is a deficient number, since it is larger than the sum of its proper divisors (512061).

6656611 is a wasteful number, since it uses less digits than its factorization.

6656611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512060.

The product of its digits is 6480, while the sum is 31.

The square root of 6656611 is about 2580.0408911488. The cubic root of 6656611 is about 188.1125307129.

The spelling of 6656611 in words is "six million, six hundred fifty-six thousand, six hundred eleven".