66635223 has 16 divisors (see below), whose sum is σ = 99025920. Its totient is φ = 39609216.

The previous prime is 66635201. The next prime is 66635227. The reversal of 66635223 is 32253666.

It is not a de Polignac number, because 66635223 - 2⁶ = 66635159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66635227) 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 15 ways as a sum of consecutive naturals, for example, 33415 + ... + 35352.

It is an arithmetic number, because the mean of its divisors is an integer number (6189120).

Almost surely, 2^66635223 is an apocalyptic number.

66635223 is a deficient number, since it is larger than the sum of its proper divisors (32390697).

66635223 is a wasteful number, since it uses less digits than its factorization.

66635223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68806.

The product of its digits is 38880, while the sum is 33.

The square root of 66635223 is about 8163.0400587036. The cubic root of 66635223 is about 405.4163741024.

Adding to 66635223 its reverse (32253666), we get a palindrome (98888889).

The spelling of 66635223 in words is "sixty-six million, six hundred thirty-five thousand, two hundred twenty-three".