66216111 has 16 divisors (see below), whose sum is σ = 95241216. Its totient is φ = 40679136.

The previous prime is 66216109. The next prime is 66216151. The reversal of 66216111 is 11161266.

It is not a de Polignac number, because 66216111 - 2¹ = 66216109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66216151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31066 + ... + 33128.

It is an arithmetic number, because the mean of its divisors is an integer number (5952576).

Almost surely, 2^66216111 is an apocalyptic number.

66216111 is a deficient number, since it is larger than the sum of its proper divisors (29025105).

66216111 is a wasteful number, since it uses less digits than its factorization.

66216111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902.

The product of its digits is 432, while the sum is 24.

The square root of 66216111 is about 8137.3282470354. The cubic root of 66216111 is about 404.5646106028.

Adding to 66216111 its reverse (11161266), we get a palindrome (77377377).

The spelling of 66216111 in words is "sixty-six million, two hundred sixteen thousand, one hundred eleven".