72220720116171 has 32 divisors (see below), whose sum is σ = 106863459978240. Its totient is φ = 43014306538400.

The previous prime is 72220720116169. The next prime is 72220720116217. The reversal of 72220720116171 is 17161102702227.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72220720116171 - 2¹ = 72220720116169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72220720116161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13185 + ... + 12018386.

It is an arithmetic number, because the mean of its divisors is an integer number (3339483124320).

Almost surely, 2^{72220720116171} is an apocalyptic number.

72220720116171 is a deficient number, since it is larger than the sum of its proper divisors (34642739862069).

72220720116171 is a wasteful number, since it uses less digits than its factorization.

72220720116171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12034727.

The product of its (nonzero) digits is 32928, while the sum is 39.

Adding to 72220720116171 its reverse (17161102702227), we get a palindrome (89381822818398).

The spelling of 72220720116171 in words is "seventy-two trillion, two hundred twenty billion, seven hundred twenty million, one hundred sixteen thousand, one hundred seventy-one".