66646933 has 8 divisors (see below), whose sum is σ = 67368960. Its totient is φ = 65928240.

The previous prime is 66646913. The next prime is 66646949. The reversal of 66646933 is 33964666.

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

It is not a de Polignac number, because 66646933 - 2⁹ = 66646421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66646933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66646903) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 64128 + ... + 65158.

It is an arithmetic number, because the mean of its divisors is an integer number (8421120).

Almost surely, 2^66646933 is an apocalyptic number.

It is an amenable number.

66646933 is a deficient number, since it is larger than the sum of its proper divisors (722027).

66646933 is a wasteful number, since it uses less digits than its factorization.

66646933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its digits is 419904, while the sum is 43.

The square root of 66646933 is about 8163.7572844861. The cubic root of 66646933 is about 405.4401210411.

The spelling of 66646933 in words is "sixty-six million, six hundred forty-six thousand, nine hundred thirty-three".