168000071081 has 8 divisors (see below), whose sum is σ = 168555897000. Its totient is φ = 167445053440.

The previous prime is 168000071051. The next prime is 168000071089. The reversal of 168000071081 is 180170000861.

It can be written as a sum of positive squares in 4 ways, for example, as 14289811600 + 153710259481 = 119540^2 + 392059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168000071081 - 2²² = 167995876777 is a prime.

It is a super-2 number, since 2×168000071081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168000071089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215741 + ... + 618501.

It is an arithmetic number, because the mean of its divisors is an integer number (21069487125).

Almost surely, 2^168000071081 is an apocalyptic number.

It is an amenable number.

168000071081 is a deficient number, since it is larger than the sum of its proper divisors (555825919).

168000071081 is an equidigital number, since it uses as much as digits as its factorization.

168000071081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404139.

The product of its (nonzero) digits is 2688, while the sum is 32.

The spelling of 168000071081 in words is "one hundred sixty-eight billion, seventy-one thousand, eighty-one".