66663222 has 16 divisors (see below), whose sum is σ = 141169392. Its totient is φ = 20913920.

The previous prime is 66663217. The next prime is 66663271. The reversal of 66663222 is 22236666.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326679 + ... + 326882.

It is an arithmetic number, because the mean of its divisors is an integer number (8823087).

Almost surely, 2^66663222 is an apocalyptic number.

66663222 is an abundant number, since it is smaller than the sum of its proper divisors (74506170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66663222 is a wasteful number, since it uses less digits than its factorization.

66663222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653583.

The product of its digits is 31104, while the sum is 33.

The square root of 66663222 is about 8164.7548646607. The cubic root of 66663222 is about 405.4731491984.

Adding to 66663222 its reverse (22236666), we get a palindrome (88899888).

The spelling of 66663222 in words is "sixty-six million, six hundred sixty-three thousand, two hundred twenty-two".