216430166 has 4 divisors (see below), whose sum is σ = 324645252. Its totient is φ = 108215082.

The previous prime is 216430157. The next prime is 216430169. The reversal of 216430166 is 661034612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216430169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54107540 + ... + 54107543.

It is an arithmetic number, because the mean of its divisors is an integer number (81161313).

Almost surely, 2^216430166 is an apocalyptic number.

216430166 is a deficient number, since it is larger than the sum of its proper divisors (108215086).

216430166 is a wasteful number, since it uses less digits than its factorization.

216430166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108215085.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 216430166 is about 14711.5657222472. The cubic root of 216430166 is about 600.3980377367.

Adding to 216430166 its reverse (661034612), we get a palindrome (877464778).

The spelling of 216430166 in words is "two hundred sixteen million, four hundred thirty thousand, one hundred sixty-six".