216533805 has 16 divisors (see below), whose sum is σ = 355818624. Its totient is φ = 112363200.

The previous prime is 216533797. The next prime is 216533809. The reversal of 216533805 is 508335612.

It is not a de Polignac number, because 216533805 - 2³ = 216533797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216533809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194521 + ... + 195630.

It is an arithmetic number, because the mean of its divisors is an integer number (22238664).

Almost surely, 2^216533805 is an apocalyptic number.

It is an amenable number.

216533805 is a deficient number, since it is larger than the sum of its proper divisors (139284819).

216533805 is a wasteful number, since it uses less digits than its factorization.

216533805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390196.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 216533805 is about 14715.0876653862. The cubic root of 216533805 is about 600.4938572857.

The spelling of 216533805 in words is "two hundred sixteen million, five hundred thirty-three thousand, eight hundred five".