216660720708 has 36 divisors (see below), whose sum is σ = 547862109340. Its totient is φ = 72194927616.

The previous prime is 216660720701. The next prime is 216660720739. The reversal of 216660720708 is 807027066612.

216660720708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 77149506564 + 139511214144 = 277758^2 + 373512^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (216660720701) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 950413 + ... + 1156116.

Almost surely, 2^216660720708 is an apocalyptic number.

It is an amenable number.

216660720708 is an abundant number, since it is smaller than the sum of its proper divisors (331201388632).

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

216660720708 is a wasteful number, since it uses less digits than its factorization.

216660720708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109396 (or 2109391 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 216660720708 in words is "two hundred sixteen billion, six hundred sixty million, seven hundred twenty thousand, seven hundred eight".