216204563 has 4 divisors (see below), whose sum is σ = 216593280. Its totient is φ = 215815848.

The previous prime is 216204533. The next prime is 216204607. The reversal of 216204563 is 365402612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216204563 - 2¹⁴ = 216188179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216204503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193523 + ... + 194636.

It is an arithmetic number, because the mean of its divisors is an integer number (54148320).

Almost surely, 2^216204563 is an apocalyptic number.

216204563 is a deficient number, since it is larger than the sum of its proper divisors (388717).

216204563 is an equidigital number, since it uses as much as digits as its factorization.

216204563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388716.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216204563 is about 14703.8961843452. The cubic root of 216204563 is about 600.1893504229.

The spelling of 216204563 in words is "two hundred sixteen million, two hundred four thousand, five hundred sixty-three".