216565165 has 8 divisors (see below), whose sum is σ = 259971480. Its totient is φ = 173189952.

The previous prime is 216565121. The next prime is 216565169. The reversal of 216565165 is 561565612.

216565165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1121481 + 215443684 = 1059^2 + 14678^2 .

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 216565165 - 2¹³ = 216556973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216565169) 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, 12231 + ... + 24139.

It is an arithmetic number, because the mean of its divisors is an integer number (32496435).

Almost surely, 2^216565165 is an apocalyptic number.

It is an amenable number.

216565165 is a deficient number, since it is larger than the sum of its proper divisors (43406315).

216565165 is a wasteful number, since it uses less digits than its factorization.

216565165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551.

The product of its digits is 54000, while the sum is 37.

The square root of 216565165 is about 14716.1531998006. The cubic root of 216565165 is about 600.5228451818.

The spelling of 216565165 in words is "two hundred sixteen million, five hundred sixty-five thousand, one hundred sixty-five".