6650666 has 16 divisors (see below), whose sum is σ = 10922688. Its totient is φ = 3012000.

The previous prime is 6650659. The next prime is 6650671. The reversal of 6650666 is 6660566.

It is a plaindrome in base 9.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10766 + ... + 11366.

It is an arithmetic number, because the mean of its divisors is an integer number (682668).

Almost surely, 2^6650666 is an apocalyptic number.

6650666 is a deficient number, since it is larger than the sum of its proper divisors (4272022).

6650666 is a wasteful number, since it uses less digits than its factorization.

6650666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 6650666 is about 2578.8885202738. Note that the first 3 decimals coincide. The cubic root of 6650666 is about 188.0565131145.

The spelling of 6650666 in words is "six million, six hundred fifty thousand, six hundred sixty-six".