216534656220 has 48 divisors (see below), whose sum is σ = 606317352480. Its totient is φ = 57740640256.

The previous prime is 216534656213. The next prime is 216534656237. The reversal of 216534656220 is 22656435612.

216534656220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3184336 + ... + 3251624.

It is an arithmetic number, because the mean of its divisors is an integer number (12631611510).

Almost surely, 2^216534656220 is an apocalyptic number.

216534656220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216534656220 is an abundant number, since it is smaller than the sum of its proper divisors (389782696260).

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

216534656220 is a wasteful number, since it uses less digits than its factorization.

216534656220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120934 (or 120932 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 216534656220 in words is "two hundred sixteen billion, five hundred thirty-four million, six hundred fifty-six thousand, two hundred twenty".