72220317082171 has 4 divisors (see below), whose sum is σ = 72226238248512. Its totient is φ = 72214395915832.

The previous prime is 72220317082169. The next prime is 72220317082181. The reversal of 72220317082171 is 17128071302227.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72220317082171 - 2¹ = 72220317082169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72220317082181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2960564875 + ... + 2960589268.

It is an arithmetic number, because the mean of its divisors is an integer number (18056559562128).

Almost surely, 2^{72220317082171} is an apocalyptic number.

72220317082171 is a deficient number, since it is larger than the sum of its proper divisors (5921166341).

72220317082171 is a wasteful number, since it uses less digits than its factorization.

72220317082171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921166340.

The product of its (nonzero) digits is 131712, while the sum is 43.

Adding to 72220317082171 its reverse (17128071302227), we get a palindrome (89348388384398).

The spelling of 72220317082171 in words is "seventy-two trillion, two hundred twenty billion, three hundred seventeen million, eighty-two thousand, one hundred seventy-one".