6666818 has 8 divisors (see below), whose sum is σ = 10014780. Its totient is φ = 3328560.

The previous prime is 6666797. The next prime is 6666833. The reversal of 6666818 is 8186666.

It can be written as a sum of positive squares in 2 ways, for example, as 6315169 + 351649 = 2513^2 + 593^2 .

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

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, 353 + ... + 3668.

Almost surely, 2^6666818 is an apocalyptic number.

6666818 is a deficient number, since it is larger than the sum of its proper divisors (3347962).

6666818 is a wasteful number, since it uses less digits than its factorization.

6666818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852.

The product of its digits is 82944, while the sum is 41.

The square root of 6666818 is about 2582.0182028793. The cubic root of 6666818 is about 188.2086298666.

The spelling of 6666818 in words is "six million, six hundred sixty-six thousand, eight hundred eighteen".