216522865 has 16 divisors (see below), whose sum is σ = 280740096. Its totient is φ = 159364800.

The previous prime is 216522809. The next prime is 216522869. The reversal of 216522865 is 568225612.

It is not a de Polignac number, because 216522865 - 2¹¹ = 216520817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216522869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14860 + ... + 25570.

It is an arithmetic number, because the mean of its divisors is an integer number (17546256).

Almost surely, 2^216522865 is an apocalyptic number.

It is an amenable number.

216522865 is a deficient number, since it is larger than the sum of its proper divisors (64217231).

216522865 is a wasteful number, since it uses less digits than its factorization.

216522865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11040.

The product of its digits is 57600, while the sum is 37.

The square root of 216522865 is about 14714.7159333777. The cubic root of 216522865 is about 600.4837441405.

The spelling of 216522865 in words is "two hundred sixteen million, five hundred twenty-two thousand, eight hundred sixty-five".