6656666 has 8 divisors (see below), whose sum is σ = 10097460. Its totient is φ = 3290848.

The previous prime is 6656659. The next prime is 6656711. The reversal of 6656666 is 6666566.

It can be written as a sum of positive squares in 2 ways, for example, as 6145441 + 511225 = 2479^2 + 715^2 .

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

It is a super-2 number, since 2×6656666² = 88622404471112, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 18521 + ... + 18876.

Almost surely, 2^6656666 is an apocalyptic number.

6656666 is a deficient number, since it is larger than the sum of its proper divisors (3440794).

6656666 is a wasteful number, since it uses less digits than its factorization.

6656666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37488.

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

The square root of 6656666 is about 2580.0515498726. The cubic root of 6656666 is about 188.1130488024.

The spelling of 6656666 in words is "six million, six hundred fifty-six thousand, six hundred sixty-six".