6668666 has 16 divisors (see below), whose sum is σ = 10800000. Its totient is φ = 3078768.

The previous prime is 6668659. The next prime is 6668687.

It is a happy number.

6668666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6668666² = 88942212439112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166 + ... + 3833.

It is an arithmetic number, because the mean of its divisors is an integer number (675000).

Almost surely, 2^6668666 is an apocalyptic number.

6668666 is a deficient number, since it is larger than the sum of its proper divisors (4131334).

6668666 is a wasteful number, since it uses less digits than its factorization.

6668666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053.

The product of its digits is 373248, while the sum is 44.

The square root of 6668666 is about 2582.3760376831. The cubic root of 6668666 is about 188.2260183427.

The spelling of 6668666 in words is "six million, six hundred sixty-eight thousand, six hundred sixty-six".