216507565 has 16 divisors (see below), whose sum is σ = 282309120. Its totient is φ = 158794560.

The previous prime is 216507547. The next prime is 216507581. The reversal of 216507565 is 565705612.

It is not a de Polignac number, because 216507565 - 2²³ = 208118957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33814 + ... + 39703.

It is an arithmetic number, because the mean of its divisors is an integer number (17644320).

Almost surely, 2^216507565 is an apocalyptic number.

It is an amenable number.

216507565 is a deficient number, since it is larger than the sum of its proper divisors (65801555).

216507565 is a wasteful number, since it uses less digits than its factorization.

216507565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73572.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 216507565 is about 14714.1960364812. The cubic root of 216507565 is about 600.4695999565.

The spelling of 216507565 in words is "two hundred sixteen million, five hundred seven thousand, five hundred sixty-five".