216606215 has 20 divisors (see below), whose sum is σ = 303247464. Its totient is φ = 148521744.

The previous prime is 216606211. The next prime is 216606233. The reversal of 216606215 is 512606612.

It is not a de Polignac number, because 216606215 - 2² = 216606211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216606211) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 2984 + ... + 21026.

Almost surely, 2^216606215 is an apocalyptic number.

216606215 is a deficient number, since it is larger than the sum of its proper divisors (86641249).

216606215 is an frugal number, since it uses more digits than its factorization.

216606215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18076 (or 18055 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 216606215 is about 14717.5478596130. The cubic root of 216606215 is about 600.5607858872.

The spelling of 216606215 in words is "two hundred sixteen million, six hundred six thousand, two hundred fifteen".