216564515 has 16 divisors (see below), whose sum is σ = 271438560. Its totient is φ = 165703680.

The previous prime is 216564511. The next prime is 216564521. The reversal of 216564515 is 515465612.

It is not a de Polignac number, because 216564515 - 2² = 216564511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216564511) 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, 995 + ... + 20835.

It is an arithmetic number, because the mean of its divisors is an integer number (16964910).

Almost surely, 2^216564515 is an apocalyptic number.

216564515 is a deficient number, since it is larger than the sum of its proper divisors (54874045).

216564515 is a wasteful number, since it uses less digits than its factorization.

216564515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19942.

The product of its digits is 36000, while the sum is 35.

The square root of 216564515 is about 14716.1311152082. The cubic root of 216564515 is about 600.5222443769.

The spelling of 216564515 in words is "two hundred sixteen million, five hundred sixty-four thousand, five hundred fifteen".