216542885 has 16 divisors (see below), whose sum is σ = 281894256. Its totient is φ = 158734848.

The previous prime is 216542873. The next prime is 216542929. The reversal of 216542885 is 588245612.

It is a happy number.

216542885 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 8 ways, for example, as 3587236 + 212955649 = 1894^2 + 14593^2 .

It is a cyclic number.

It is not a de Polignac number, because 216542885 - 2¹⁰ = 216541861 is a prime.

It is a Duffinian number.

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, 3254 + ... + 21063.

It is an arithmetic number, because the mean of its divisors is an integer number (17618391).

Almost surely, 2^216542885 is an apocalyptic number.

It is an amenable number.

216542885 is a deficient number, since it is larger than the sum of its proper divisors (65351371).

216542885 is a wasteful number, since it uses less digits than its factorization.

216542885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24472.

The product of its digits is 153600, while the sum is 41.

The square root of 216542885 is about 14715.3961890260. The cubic root of 216542885 is about 600.5022507526.

The spelling of 216542885 in words is "two hundred sixteen million, five hundred forty-two thousand, eight hundred eighty-five".