171855204072 has 64 divisors (see below), whose sum is σ = 435791664000. Its totient is φ = 56464961280.

The previous prime is 171855204043. The next prime is 171855204083. The reversal of 171855204072 is 270402558171.

It is a super-2 number, since 2×171855204072² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9460054 + ... + 9478202.

It is an arithmetic number, because the mean of its divisors is an integer number (6809244750).

Almost surely, 2^171855204072 is an apocalyptic number.

171855204072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

171855204072 is an abundant number, since it is smaller than the sum of its proper divisors (263936459928).

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

171855204072 is a wasteful number, since it uses less digits than its factorization.

171855204072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23786 (or 23782 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The spelling of 171855204072 in words is "one hundred seventy-one billion, eight hundred fifty-five million, two hundred four thousand, seventy-two".