66222223 has 4 divisors (see below), whose sum is σ = 66241800. Its totient is φ = 66202648.

The previous prime is 66222209. The next prime is 66222227. The reversal of 66222223 is 32222266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32222266 = 2 ⋅16111133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66222223 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 (66222227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3265 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (16560450).

Almost surely, 2^66222223 is an apocalyptic number.

66222223 is a deficient number, since it is larger than the sum of its proper divisors (19577).

66222223 is a wasteful number, since it uses less digits than its factorization.

66222223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19576.

The product of its digits is 3456, while the sum is 25.

The square root of 66222223 is about 8137.7037916110. The cubic root of 66222223 is about 404.5770578395.

Adding to 66222223 its reverse (32222266), we get a palindrome (98444489).

The spelling of 66222223 in words is "sixty-six million, two hundred twenty-two thousand, two hundred twenty-three".