216418505 has 8 divisors (see below), whose sum is σ = 259958400. Its totient is φ = 172964016.

The previous prime is 216418469. The next prime is 216418537. The reversal of 216418505 is 505814612.

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

It is a cyclic number.

It is not a de Polignac number, because 216418505 - 2⁸ = 216418249 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15635 + ... + 26024.

It is an arithmetic number, because the mean of its divisors is an integer number (32494800).

Almost surely, 2^216418505 is an apocalyptic number.

It is an amenable number.

216418505 is a deficient number, since it is larger than the sum of its proper divisors (43539895).

216418505 is a wasteful number, since it uses less digits than its factorization.

216418505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42703.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 216418505 is about 14711.1693960745. The cubic root of 216418505 is about 600.3872546323.

The spelling of 216418505 in words is "two hundred sixteen million, four hundred eighteen thousand, five hundred five".