171728639122 has 8 divisors (see below), whose sum is σ = 258522897996. Its totient is φ = 85554339792.

The previous prime is 171728639111. The next prime is 171728639129. The reversal of 171728639122 is 221936827171.

It can be written as a sum of positive squares in 2 ways, for example, as 171378612441 + 350026681 = 413979^2 + 18709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (171728639129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154989193 + ... + 154990300.

Almost surely, 2^171728639122 is an apocalyptic number.

171728639122 is a deficient number, since it is larger than the sum of its proper divisors (86794258874).

171728639122 is a wasteful number, since it uses less digits than its factorization.

171728639122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309979772.

The product of its digits is 508032, while the sum is 49.

The spelling of 171728639122 in words is "one hundred seventy-one billion, seven hundred twenty-eight million, six hundred thirty-nine thousand, one hundred twenty-two".