216240163 has 4 divisors (see below), whose sum is σ = 221269048. Its totient is φ = 211211280.

The previous prime is 216240161. The next prime is 216240169. The reversal of 216240163 is 361042612.

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 216240163 - 2¹ = 216240161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216240161) 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, 2514378 + ... + 2514463.

It is an arithmetic number, because the mean of its divisors is an integer number (55317262).

Almost surely, 2^216240163 is an apocalyptic number.

216240163 is a deficient number, since it is larger than the sum of its proper divisors (5028885).

216240163 is an equidigital number, since it uses as much as digits as its factorization.

216240163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028884.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 216240163 is about 14705.1066980148. The cubic root of 216240163 is about 600.2222907827. Note that the first 4 decimals are identical.

Adding to 216240163 its reverse (361042612), we get a palindrome (577282775).

The spelling of 216240163 in words is "two hundred sixteen million, two hundred forty thousand, one hundred sixty-three".