216504166 has 8 divisors (see below), whose sum is σ = 324820440. Its totient is φ = 108230688.

The previous prime is 216504151. The next prime is 216504181. The reversal of 216504166 is 661405612.

It is an interprime number because it is at equal distance from previous prime (216504151) and next prime (216504181).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9825 + ... + 23011.

It is an arithmetic number, because the mean of its divisors is an integer number (40602555).

Almost surely, 2^216504166 is an apocalyptic number.

216504166 is a deficient number, since it is larger than the sum of its proper divisors (108316274).

216504166 is a wasteful number, since it uses less digits than its factorization.

216504166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21398.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 216504166 is about 14714.0805353240. The cubic root of 216504166 is about 600.4664576385.

Adding to 216504166 its reverse (661405612), we get a palindrome (877909778).

The spelling of 216504166 in words is "two hundred sixteen million, five hundred four thousand, one hundred sixty-six".