171155887320 has 128 divisors (see below), whose sum is σ = 560390400000. Its totient is φ = 41474273280.

The previous prime is 171155887319. The next prime is 171155887369. The reversal of 171155887320 is 23788551171.

It is a self number, because there is not a number n which added to its sum of digits gives 171155887320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3139656 + ... + 3193704.

It is an arithmetic number, because the mean of its divisors is an integer number (4378050000).

Almost surely, 2^171155887320 is an apocalyptic number.

171155887320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171155887320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280195200000).

171155887320 is an abundant number, since it is smaller than the sum of its proper divisors (389234512680).

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

171155887320 is a wasteful number, since it uses less digits than its factorization.

171155887320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56473 (or 56469 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 48.

The spelling of 171155887320 in words is "one hundred seventy-one billion, one hundred fifty-five million, eight hundred eighty-seven thousand, three hundred twenty".