66944966 has 16 divisors (see below), whose sum is σ = 110555280. Its totient is φ = 30149280.

The previous prime is 66944959. The next prime is 66944981.

It is a happy number.

66944966 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11561 + ... + 16356.

It is an arithmetic number, because the mean of its divisors is an integer number (6909705).

Almost surely, 2^66944966 is an apocalyptic number.

66944966 is a deficient number, since it is larger than the sum of its proper divisors (43610314).

66944966 is a wasteful number, since it uses less digits than its factorization.

66944966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28039.

The product of its digits is 1679616, while the sum is 50.

The square root of 66944966 is about 8181.9903446533. The cubic root of 66944966 is about 406.0435739913.

The spelling of 66944966 in words is "sixty-six million, nine hundred forty-four thousand, nine hundred sixty-six".