168118762108181 has 4 divisors (see below), whose sum is σ = 168118793097612. Its totient is φ = 168118731118752.

The previous prime is 168118762108177. The next prime is 168118762108201. The reversal of 168118762108181 is 181801267811861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63687837577156 + 104430924531025 = 7980466^2 + 10219145^2 .

It is a cyclic number.

It is not a de Polignac number, because 168118762108181 - 2² = 168118762108177 is a prime.

It is a super-2 number, since 2×168118762108181² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168118762108181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168118762308181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4977686 + ... + 19000391.

It is an arithmetic number, because the mean of its divisors is an integer number (42029698274403).

Almost surely, 2^{168118762108181} is an apocalyptic number.

It is an amenable number.

168118762108181 is a deficient number, since it is larger than the sum of its proper divisors (30989431).

168118762108181 is an equidigital number, since it uses as much as digits as its factorization.

168118762108181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30989430.

The product of its (nonzero) digits is 2064384, while the sum is 59.

The spelling of 168118762108181 in words is "one hundred sixty-eight trillion, one hundred eighteen billion, seven hundred sixty-two million, one hundred eight thousand, one hundred eighty-one".