171716427691 has 4 divisors (see below), whose sum is σ = 171849439384. Its totient is φ = 171583416000.

The previous prime is 171716427677. The next prime is 171716427731. The reversal of 171716427691 is 196724617171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196724617171 = 43 ⋅4574991097.

It is a cyclic number.

It is not a de Polignac number, because 171716427691 - 2⁷ = 171716427563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171716427791) 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, 66503910 + ... + 66506491.

It is an arithmetic number, because the mean of its divisors is an integer number (42962359846).

Almost surely, 2^171716427691 is an apocalyptic number.

171716427691 is a deficient number, since it is larger than the sum of its proper divisors (133011693).

171716427691 is a wasteful number, since it uses less digits than its factorization.

171716427691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133011692.

The product of its digits is 889056, while the sum is 52.

The spelling of 171716427691 in words is "one hundred seventy-one billion, seven hundred sixteen million, four hundred twenty-seven thousand, six hundred ninety-one".