168611917671 has 12 divisors (see below), whose sum is σ = 243801384840. Its totient is φ = 112292174160.

The previous prime is 168611917651. The next prime is 168611917679. The reversal of 168611917671 is 176719116861.

It is a happy number.

168611917671 is a `hidden beast` number, since 1 + 6 + 8 + 611 + 9 + 17 + 6 + 7 + 1 = 666.

It is not a de Polignac number, because 168611917671 - 2⁷ = 168611917543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168611917679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9638356 + ... + 9655833.

It is an arithmetic number, because the mean of its divisors is an integer number (20316782070).

Almost surely, 2^168611917671 is an apocalyptic number.

168611917671 is a deficient number, since it is larger than the sum of its proper divisors (75189467169).

168611917671 is a wasteful number, since it uses less digits than its factorization.

168611917671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19295166 (or 19295163 counting only the distinct ones).

The product of its digits is 762048, while the sum is 54.

The spelling of 168611917671 in words is "one hundred sixty-eight billion, six hundred eleven million, nine hundred seventeen thousand, six hundred seventy-one".