6666656 has 12 divisors (see below), whose sum is σ = 13125042. Its totient is φ = 3333312.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666656 is 6566666.

It can be written as a sum of positive squares in only one way, i.e., 6330256 + 336400 = 2516^2 + 580^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 104135 + ... + 104198.

Almost surely, 2^6666656 is an apocalyptic number.

It is an amenable number.

6666656 is a deficient number, since it is larger than the sum of its proper divisors (6458386).

6666656 is a wasteful number, since it uses less digits than its factorization.

6666656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208343 (or 208335 counting only the distinct ones).

The product of its digits is 233280, while the sum is 41.

The square root of 6666656 is about 2581.9868318797. The cubic root of 6666656 is about 188.2071053990.

The spelling of 6666656 in words is "six million, six hundred sixty-six thousand, six hundred fifty-six".