171320132720 has 80 divisors (see below), whose sum is σ = 436333724640. Its totient is φ = 62039654400.

The previous prime is 171320132689. The next prime is 171320132723. The reversal of 171320132720 is 27231023171.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171320132723) 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, 191825 + ... + 615984.

It is an arithmetic number, because the mean of its divisors is an integer number (5454171558).

Almost surely, 2^171320132720 is an apocalyptic number.

171320132720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171320132720 is an abundant number, since it is smaller than the sum of its proper divisors (265013591920).

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

171320132720 is a wasteful number, since it uses less digits than its factorization.

171320132720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808074 (or 808068 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

Adding to 171320132720 its reverse (27231023171), we get a palindrome (198551155891).

The spelling of 171320132720 in words is "one hundred seventy-one billion, three hundred twenty million, one hundred thirty-two thousand, seven hundred twenty".