171721539160 has 64 divisors (see below), whose sum is σ = 397090782720. Its totient is φ = 66785886720.

The previous prime is 171721539133. The next prime is 171721539161. The reversal of 171721539160 is 61935127171.

171721539160 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×171721539160² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171721539161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2137642 + ... + 2216518.

It is an arithmetic number, because the mean of its divisors is an integer number (6204543480).

Almost surely, 2^171721539160 is an apocalyptic number.

171721539160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171721539160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198545391360).

171721539160 is an abundant number, since it is smaller than the sum of its proper divisors (225369243560).

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

171721539160 is a wasteful number, since it uses less digits than its factorization.

171721539160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80396 (or 80392 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 43.

The spelling of 171721539160 in words is "one hundred seventy-one billion, seven hundred twenty-one million, five hundred thirty-nine thousand, one hundred sixty".