666845966 has 8 divisors (see below), whose sum is σ = 1017222840. Its totient is φ = 327771688.

The previous prime is 666845953. The next prime is 666845989. The reversal of 666845966 is 669548666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825501 + ... + 2825736.

It is an arithmetic number, because the mean of its divisors is an integer number (127152855).

Almost surely, 2^666845966 is an apocalyptic number.

666845966 is a deficient number, since it is larger than the sum of its proper divisors (350376874).

666845966 is a wasteful number, since it uses less digits than its factorization.

666845966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5651298.

The product of its digits is 11197440, while the sum is 56.

The square root of 666845966 is about 25823.3608579519. The cubic root of 666845966 is about 873.6587739138.

The spelling of 666845966 in words is "six hundred sixty-six million, eight hundred forty-five thousand, nine hundred sixty-six".