171320402720 has 24 divisors (see below), whose sum is σ = 404744451804. Its totient is φ = 68528161024.

The previous prime is 171320402717. The next prime is 171320402761. The reversal of 171320402720 is 27204023171.

It can be written as a sum of positive squares in 2 ways, for example, as 160733639056 + 10586763664 = 400916^2 + 102892^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535376099 + ... + 535376418.

Almost surely, 2^171320402720 is an apocalyptic number.

171320402720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171320402720 is an abundant number, since it is smaller than the sum of its proper divisors (233424049084).

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

171320402720 is a wasteful number, since it uses less digits than its factorization.

171320402720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070752532 (or 1070752524 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

Adding to 171320402720 its reverse (27204023171), we get a palindrome (198524425891).

The spelling of 171320402720 in words is "one hundred seventy-one billion, three hundred twenty million, four hundred two thousand, seven hundred twenty".