168138140028 has 24 divisors (see below), whose sum is σ = 393575761488. Its totient is φ = 55866984576.

The previous prime is 168138139993. The next prime is 168138140069. The reversal of 168138140028 is 820041831861.

168138140028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22378851 + ... + 22386362.

It is an arithmetic number, because the mean of its divisors is an integer number (16398990062).

Almost surely, 2^168138140028 is an apocalyptic number.

It is an amenable number.

168138140028 is an abundant number, since it is smaller than the sum of its proper divisors (225437621460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168138140028 is a wasteful number, since it uses less digits than its factorization.

168138140028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44765533 (or 44765531 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

Adding to 168138140028 its reverse (820041831861), we get a palindrome (988179971889).

The spelling of 168138140028 in words is "one hundred sixty-eight billion, one hundred thirty-eight million, one hundred forty thousand, twenty-eight".