66223111 has 4 divisors (see below), whose sum is σ = 66367224. Its totient is φ = 66079000.

The previous prime is 66223103. The next prime is 66223121. The reversal of 66223111 is 11132266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11132266 = 2 ⋅5566133.

It is a cyclic number.

It is not a de Polignac number, because 66223111 - 2³ = 66223103 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 (66223121) 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, 71365 + ... + 72286.

It is an arithmetic number, because the mean of its divisors is an integer number (16591806).

Almost surely, 2^66223111 is an apocalyptic number.

66223111 is a deficient number, since it is larger than the sum of its proper divisors (144113).

66223111 is a wasteful number, since it uses less digits than its factorization.

66223111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144112.

The product of its digits is 432, while the sum is 22.

The square root of 66223111 is about 8137.7583522737. The cubic root of 66223111 is about 404.5788662094.

Adding to 66223111 its reverse (11132266), we get a palindrome (77355377).

The spelling of 66223111 in words is "sixty-six million, two hundred twenty-three thousand, one hundred eleven".