168646999871 has 4 divisors (see below), whose sum is σ = 192739428432. Its totient is φ = 144554571312.

The previous prime is 168646999861. The next prime is 168646999897. The reversal of 168646999871 is 178999646861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168646999871 - 2²² = 168642805567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168646999811) 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, 12046214270 + ... + 12046214283.

It is an arithmetic number, because the mean of its divisors is an integer number (48184857108).

Almost surely, 2^168646999871 is an apocalyptic number.

168646999871 is a deficient number, since it is larger than the sum of its proper divisors (24092428561).

168646999871 is an equidigital number, since it uses as much as digits as its factorization.

168646999871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24092428560.

The product of its digits is 282175488, while the sum is 74.

The spelling of 168646999871 in words is "one hundred sixty-eight billion, six hundred forty-six million, nine hundred ninety-nine thousand, eight hundred seventy-one".