216565613 has 8 divisors (see below), whose sum is σ = 241280640. Its totient is φ = 192688480.

The previous prime is 216565511. The next prime is 216565621. The reversal of 216565613 is 316565612.

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 216565613 - 2²⁰ = 215517037 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 (216565913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208928 + ... + 209961.

It is an arithmetic number, because the mean of its divisors is an integer number (30160080).

Almost surely, 2^216565613 is an apocalyptic number.

It is an amenable number.

216565613 is a deficient number, since it is larger than the sum of its proper divisors (24715027).

216565613 is a wasteful number, since it uses less digits than its factorization.

216565613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418947.

The product of its digits is 32400, while the sum is 35.

The square root of 216565613 is about 14716.1684211618. The cubic root of 216565613 is about 600.5232592743.

Subtracting 216565613 from its reverse (316565612), we obtain a palindrome (99999999).

The spelling of 216565613 in words is "two hundred sixteen million, five hundred sixty-five thousand, six hundred thirteen".