66685223 has 8 divisors (see below), whose sum is σ = 72967440. Its totient is φ = 60439680.

The previous prime is 66685207. The next prime is 66685249. The reversal of 66685223 is 32258666.

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

It is a cyclic number.

It is not a de Polignac number, because 66685223 - 2⁴ = 66685207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66685253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5288 + ... + 12701.

It is an arithmetic number, because the mean of its divisors is an integer number (9120930).

Almost surely, 2^66685223 is an apocalyptic number.

66685223 is a deficient number, since it is larger than the sum of its proper divisors (6282217).

66685223 is a wasteful number, since it uses less digits than its factorization.

66685223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18337.

The product of its digits is 103680, while the sum is 38.

The square root of 66685223 is about 8166.1020689188. The cubic root of 66685223 is about 405.5177506708.

The spelling of 66685223 in words is "sixty-six million, six hundred eighty-five thousand, two hundred twenty-three".