216321673856 has 32 divisors (see below), whose sum is σ = 445813802100. Its totient is φ = 104431151104.

The previous prime is 216321673847. The next prime is 216321673859. The reversal of 216321673856 is 658376123612.

It can be written as a sum of positive squares in 2 ways, for example, as 208863624256 + 7458049600 = 457016^2 + 86360^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (216321673859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29134445 + ... + 29141868.

Almost surely, 2^216321673856 is an apocalyptic number.

It is an amenable number.

216321673856 is an abundant number, since it is smaller than the sum of its proper divisors (229492128244).

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

216321673856 is an equidigital number, since it uses as much as digits as its factorization.

216321673856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58276356 (or 58276344 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The spelling of 216321673856 in words is "two hundred sixteen billion, three hundred twenty-one million, six hundred seventy-three thousand, eight hundred fifty-six".