666647006 has 4 divisors (see below), whose sum is σ = 999970512. Its totient is φ = 333323502.

The previous prime is 666646999. The next prime is 666647021. The reversal of 666647006 is 600746666.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166661750 + ... + 166661753.

It is an arithmetic number, because the mean of its divisors is an integer number (249992628).

Almost surely, 2^666647006 is an apocalyptic number.

666647006 is a deficient number, since it is larger than the sum of its proper divisors (333323506).

666647006 is a wasteful number, since it uses less digits than its factorization.

666647006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333323505.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 666647006 is about 25819.5082447362. The cubic root of 666647006 is about 873.5718770647.

The spelling of 666647006 in words is "six hundred sixty-six million, six hundred forty-seven thousand, six".