161317808271 has 12 divisors (see below), whose sum is σ = 237972370272. Its totient is φ = 105257009376.

The previous prime is 161317808261. The next prime is 161317808329. The reversal of 161317808271 is 172808713161.

161317808271 is a `hidden beast` number, since 1 + 61 + 317 + 8 + 0 + 8 + 271 = 666.

161317808271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161317808271 - 2⁷ = 161317808143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161317808261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190682566 + ... + 190683411.

It is an arithmetic number, because the mean of its divisors is an integer number (19831030856).

Almost surely, 2^161317808271 is an apocalyptic number.

161317808271 is a deficient number, since it is larger than the sum of its proper divisors (76654562001).

161317808271 is a wasteful number, since it uses less digits than its factorization.

161317808271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381366030 (or 381366027 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The spelling of 161317808271 in words is "one hundred sixty-one billion, three hundred seventeen million, eight hundred eight thousand, two hundred seventy-one".