66654223 has 8 divisors (see below), whose sum is σ = 70329600. Its totient is φ = 62995608.

The previous prime is 66654221. The next prime is 66654239. The reversal of 66654223 is 32245666.

66654223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66654223 - 2¹ = 66654221 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 (66654221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4458 + ... + 12376.

It is an arithmetic number, because the mean of its divisors is an integer number (8791200).

Almost surely, 2^66654223 is an apocalyptic number.

66654223 is a deficient number, since it is larger than the sum of its proper divisors (3675377).

66654223 is a wasteful number, since it uses less digits than its factorization.

66654223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381.

The product of its digits is 51840, while the sum is 34.

The square root of 66654223 is about 8164.2037578689. The cubic root of 66654223 is about 405.4549031703.

Adding to 66654223 its reverse (32245666), we get a palindrome (98899889).

The spelling of 66654223 in words is "sixty-six million, six hundred fifty-four thousand, two hundred twenty-three".