216355512 has 16 divisors (see below), whose sum is σ = 540888840. Its totient is φ = 72118496.

The previous prime is 216355511. The next prime is 216355543. The reversal of 216355512 is 215553612.

It is a happy number.

216355512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 216355512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216355511) 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, 4507383 + ... + 4507430.

Almost surely, 2^216355512 is an apocalyptic number.

It is an amenable number.

216355512 is an abundant number, since it is smaller than the sum of its proper divisors (324533328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216355512 is a wasteful number, since it uses less digits than its factorization.

216355512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9014822 (or 9014818 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 216355512 is about 14709.0282479843. The cubic root of 216355512 is about 600.3289973460.

It can be divided in two parts, 2163 and 55512, that added together give a palindrome (57675).

The spelling of 216355512 in words is "two hundred sixteen million, three hundred fifty-five thousand, five hundred twelve".