168135004122011 has 4 divisors (see below), whose sum is σ = 168171107842392. Its totient is φ = 168098900401632.

The previous prime is 168135004121977. The next prime is 168135004122017. The reversal of 168135004122011 is 110221400531861.

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 168135004122011 - 2²² = 168134999927707 is a prime.

It is a super-2 number, since 2×168135004122011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168135004122017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18051853205 + ... + 18051862518.

It is an arithmetic number, because the mean of its divisors is an integer number (42042776960598).

Almost surely, 2^{168135004122011} is an apocalyptic number.

168135004122011 is a deficient number, since it is larger than the sum of its proper divisors (36103720381).

168135004122011 is an equidigital number, since it uses as much as digits as its factorization.

168135004122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36103720380.

The product of its (nonzero) digits is 11520, while the sum is 35.

Adding to 168135004122011 its reverse (110221400531861), we get a palindrome (278356404653872).

The spelling of 168135004122011 in words is "one hundred sixty-eight trillion, one hundred thirty-five billion, four million, one hundred twenty-two thousand, eleven".