217373848656 has 80 divisors (see below), whose sum is σ = 570035182080. Its totient is φ = 71368260480.

The previous prime is 217373848649. The next prime is 217373848661. The reversal of 217373848656 is 656848373712.

It is a happy number.

217373848656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 217373848656.

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, 1236285 + ... + 1401123.

It is an arithmetic number, because the mean of its divisors is an integer number (7125439776).

Almost surely, 2^217373848656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217373848656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285017591040).

217373848656 is an abundant number, since it is smaller than the sum of its proper divisors (352661333424).

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

217373848656 is a wasteful number, since it uses less digits than its factorization.

217373848656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165264 (or 165258 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 60.

The spelling of 217373848656 in words is "two hundred seventeen billion, three hundred seventy-three million, eight hundred forty-eight thousand, six hundred fifty-six".