171727996689 has 6 divisors (see below), whose sum is σ = 248051550786. Its totient is φ = 114485331120.

The previous prime is 171727996667. The next prime is 171727996753. The reversal of 171727996689 is 986699727171.

It can be written as a sum of positive squares in only one way, i.e., 170245361664 + 1482635025 = 412608^2 + 38505^2 .

It is not a de Polignac number, because 171727996689 - 2²¹ = 171725899537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171727996639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9540444252 + ... + 9540444269.

It is an arithmetic number, because the mean of its divisors is an integer number (41341925131).

Almost surely, 2^171727996689 is an apocalyptic number.

It is an amenable number.

171727996689 is a deficient number, since it is larger than the sum of its proper divisors (76323554097).

171727996689 is a wasteful number, since it uses less digits than its factorization.

171727996689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19080888527 (or 19080888524 counting only the distinct ones).

The product of its digits is 144027072, while the sum is 72.

The spelling of 171727996689 in words is "one hundred seventy-one billion, seven hundred twenty-seven million, nine hundred ninety-six thousand, six hundred eighty-nine".