216065565617 has 4 divisors (see below), whose sum is σ = 235707889776. Its totient is φ = 196423241460.

The previous prime is 216065565607. The next prime is 216065565647. The reversal of 216065565617 is 716565560612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216065565617 - 2⁶ = 216065565553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216065565607) 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, 9821162063 + ... + 9821162084.

It is an arithmetic number, because the mean of its divisors is an integer number (58926972444).

Almost surely, 2^216065565617 is an apocalyptic number.

It is an amenable number.

216065565617 is a deficient number, since it is larger than the sum of its proper divisors (19642324159).

216065565617 is a wasteful number, since it uses less digits than its factorization.

216065565617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19642324158.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 216065565617 in words is "two hundred sixteen billion, sixty-five million, five hundred sixty-five thousand, six hundred seventeen".