171256316720 has 40 divisors (see below), whose sum is σ = 407430733776. Its totient is φ = 66909443328.

The previous prime is 171256316719. The next prime is 171256316723. The reversal of 171256316720 is 27613652171.

171256316720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (171256316723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24888467 + ... + 24895346.

Almost surely, 2^171256316720 is an apocalyptic number.

171256316720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171256316720 is an abundant number, since it is smaller than the sum of its proper divisors (236174417056).

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

171256316720 is a wasteful number, since it uses less digits than its factorization.

171256316720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49783869 (or 49783863 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

Adding to 171256316720 its reverse (27613652171), we get a palindrome (198869968891).

The spelling of 171256316720 in words is "one hundred seventy-one billion, two hundred fifty-six million, three hundred sixteen thousand, seven hundred twenty".