216065879 has 4 divisors (see below), whose sum is σ = 216095880. Its totient is φ = 216035880.

The previous prime is 216065873. The next prime is 216065951. The reversal of 216065879 is 978560612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216065879 - 2²⁰ = 215017303 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 (216065873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3017 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (54023970).

Almost surely, 2^216065879 is an apocalyptic number.

216065879 is a deficient number, since it is larger than the sum of its proper divisors (30001).

216065879 is a wasteful number, since it uses less digits than its factorization.

216065879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30000.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 216065879 is about 14699.1795349264. The cubic root of 216065879 is about 600.0609928736.

The spelling of 216065879 in words is "two hundred sixteen million, sixty-five thousand, eight hundred seventy-nine".