217663189320 has 64 divisors (see below), whose sum is σ = 653888027520. Its totient is φ = 57963654144.

The previous prime is 217663189307. The next prime is 217663189343. The reversal of 217663189320 is 23981366712.

217663189320 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 217663189320.

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, 1160257 + ... + 1334736.

It is an arithmetic number, because the mean of its divisors is an integer number (10217000430).

Almost surely, 2^217663189320 is an apocalyptic number.

217663189320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217663189320 is an abundant number, since it is smaller than the sum of its proper divisors (436224838200).

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

217663189320 is a wasteful number, since it uses less digits than its factorization.

217663189320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495734 (or 2495730 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 217663189320 in words is "two hundred seventeen billion, six hundred sixty-three million, one hundred eighty-nine thousand, three hundred twenty".