216311166 has 12 divisors (see below), whose sum is σ = 468674232. Its totient is φ = 72103716.

The previous prime is 216311153. The next prime is 216311167. The reversal of 216311166 is 661113612.

216311166 is a `hidden beast` number, since 21 + 631 + 1 + 1 + 6 + 6 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216311167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6008626 + ... + 6008661.

It is an arithmetic number, because the mean of its divisors is an integer number (39056186).

Almost surely, 2^216311166 is an apocalyptic number.

216311166 is an abundant number, since it is smaller than the sum of its proper divisors (252363066).

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

216311166 is a wasteful number, since it uses less digits than its factorization.

216311166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12017295 (or 12017292 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 216311166 is about 14707.5207292052. The cubic root of 216311166 is about 600.2879784253.

Adding to 216311166 its reverse (661113612), we get a palindrome (877424778).

The spelling of 216311166 in words is "two hundred sixteen million, three hundred eleven thousand, one hundred sixty-six".