171878882538 has 64 divisors (see below), whose sum is σ = 380119703040. Its totient is φ = 51378840000.

The previous prime is 171878882521. The next prime is 171878882557. The reversal of 171878882538 is 835288878171.

It is a Harshad number since it is a multiple of its sum of digits (66).

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 31 ways as a sum of consecutive naturals, for example, 1580413 + ... + 1685663.

It is an arithmetic number, because the mean of its divisors is an integer number (5939370360).

Almost surely, 2^171878882538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171878882538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190059851520).

171878882538 is an abundant number, since it is smaller than the sum of its proper divisors (208240820502).

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

171878882538 is a wasteful number, since it uses less digits than its factorization.

171878882538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105603.

The product of its digits is 48168960, while the sum is 66.

The spelling of 171878882538 in words is "one hundred seventy-one billion, eight hundred seventy-eight million, eight hundred eighty-two thousand, five hundred thirty-eight".