171555538272 has 24 divisors (see below), whose sum is σ = 450333288216. Its totient is φ = 57185179392.

The previous prime is 171555538249. The next prime is 171555538279. The reversal of 171555538272 is 272835555171.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171555538279) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 893518333 + ... + 893518524.

It is an arithmetic number, because the mean of its divisors is an integer number (18763887009).

Almost surely, 2^171555538272 is an apocalyptic number.

171555538272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

171555538272 is an abundant number, since it is smaller than the sum of its proper divisors (278777749944).

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

171555538272 is a wasteful number, since it uses less digits than its factorization.

171555538272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787036870 (or 1787036862 counting only the distinct ones).

The product of its digits is 2940000, while the sum is 51.

The spelling of 171555538272 in words is "one hundred seventy-one billion, five hundred fifty-five million, five hundred thirty-eight thousand, two hundred seventy-two".