6664666 has 8 divisors (see below), whose sum is σ = 10008000. Its totient is φ = 3328668.

The previous prime is 6664661. The next prime is 6664667.

6664666 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2335 + ... + 4333.

It is an arithmetic number, because the mean of its divisors is an integer number (1251000).

Almost surely, 2^6664666 is an apocalyptic number.

6664666 is a deficient number, since it is larger than the sum of its proper divisors (3343334).

6664666 is a wasteful number, since it uses less digits than its factorization.

6664666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668.

The product of its digits is 186624, while the sum is 40.

The square root of 6664666 is about 2581.6014409664. The cubic root of 6664666 is about 188.1883768984.

The spelling of 6664666 in words is "six million, six hundred sixty-four thousand, six hundred sixty-six".