171705016885 has 4 divisors (see below), whose sum is σ = 206046020268. Its totient is φ = 137364013504.

The previous prime is 171705016859. The next prime is 171705016913. The reversal of 171705016885 is 588610507171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588610507171 = 464801 ⋅1266371.

It can be written as a sum of positive squares in 2 ways, for example, as 85305469041 + 86399547844 = 292071^2 + 293938^2 .

It is a cyclic number.

It is not a de Polignac number, because 171705016885 - 2⁷ = 171705016757 is a prime.

It is a super-2 number, since 2×171705016885² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17170501684 + ... + 17170501693.

It is an arithmetic number, because the mean of its divisors is an integer number (51511505067).

Almost surely, 2^171705016885 is an apocalyptic number.

It is an amenable number.

171705016885 is a deficient number, since it is larger than the sum of its proper divisors (34341003383).

171705016885 is an equidigital number, since it uses as much as digits as its factorization.

171705016885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34341003382.

The product of its (nonzero) digits is 470400, while the sum is 49.

The spelling of 171705016885 in words is "one hundred seventy-one billion, seven hundred five million, sixteen thousand, eight hundred eighty-five".