66663223 has 8 divisors (see below), whose sum is σ = 75885696. Its totient is φ = 57967800.

The previous prime is 66663217. The next prime is 66663271. The reversal of 66663223 is 32236666.

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

It is a de Polignac number, because none of the positive numbers 2^k-66663223 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 (66663283) 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, 131493 + ... + 131998.

It is an arithmetic number, because the mean of its divisors is an integer number (9485712).

Almost surely, 2^66663223 is an apocalyptic number.

66663223 is a deficient number, since it is larger than the sum of its proper divisors (9222473).

66663223 is a wasteful number, since it uses less digits than its factorization.

66663223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263525.

The product of its digits is 46656, while the sum is 34.

The square root of 66663223 is about 8164.7549258995. The cubic root of 66663223 is about 405.4731512259.

Adding to 66663223 its reverse (32236666), we get a palindrome (98899889).

It can be divided in two parts, 6666 and 3223, that added together give a palindrome (9889).

The spelling of 66663223 in words is "sixty-six million, six hundred sixty-three thousand, two hundred twenty-three".