216316665 has 24 divisors (see below), whose sum is σ = 377657280. Its totient is φ = 114535584.

The previous prime is 216316651. The next prime is 216316673. The reversal of 216316665 is 566613612.

It is not a de Polignac number, because 216316665 - 2⁶ = 216316601 is a prime.

It is a super-3 number, since 3×216316665³ (a number of 26 digits) contains 333 as substring.

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 23 ways as a sum of consecutive naturals, for example, 11037 + ... + 23546.

It is an arithmetic number, because the mean of its divisors is an integer number (15735720).

Almost surely, 2^216316665 is an apocalyptic number.

It is an amenable number.

216316665 is a deficient number, since it is larger than the sum of its proper divisors (161340615).

216316665 is a wasteful number, since it uses less digits than its factorization.

216316665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34733 (or 34730 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 216316665 is about 14707.7076731896. The cubic root of 216316665 is about 600.2930651647.

The spelling of 216316665 in words is "two hundred sixteen million, three hundred sixteen thousand, six hundred sixty-five".