72171422171 has 8 divisors (see below), whose sum is σ = 72487746240. Its totient is φ = 71855574912.

The previous prime is 72171422117. The next prime is 72171422173. The reversal of 72171422171 is 17122417127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72171422171 is a prime.

It is a super-3 number, since 3×72171422171³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72171422173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185891 + ... + 422963.

It is an arithmetic number, because the mean of its divisors is an integer number (9060968280).

Almost surely, 2^72171422171 is an apocalyptic number.

72171422171 is a deficient number, since it is larger than the sum of its proper divisors (316324069).

72171422171 is a wasteful number, since it uses less digits than its factorization.

72171422171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238405.

The product of its digits is 10976, while the sum is 35.

Adding to 72171422171 its reverse (17122417127), we get a palindrome (89293839298).

The spelling of 72171422171 in words is "seventy-two billion, one hundred seventy-one million, four hundred twenty-two thousand, one hundred seventy-one".