168313771836 has 144 divisors (see below), whose sum is σ = 515018649600. Its totient is φ = 45245329920.

The previous prime is 168313771781. The next prime is 168313771867. The reversal of 168313771836 is 638177313861.

168313771836 is a `hidden beast` number, since 1 + 68 + 31 + 377 + 183 + 6 = 666.

It is a super-2 number, since 2×168313771836² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18292365 + ... + 18301563.

It is an arithmetic number, because the mean of its divisors is an integer number (3576518400).

Almost surely, 2^168313771836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168313771836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257509324800).

168313771836 is an abundant number, since it is smaller than the sum of its proper divisors (346704877764).

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

168313771836 is a wasteful number, since it uses less digits than its factorization.

168313771836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13504 (or 13499 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 168313771836 in words is "one hundred sixty-eight billion, three hundred thirteen million, seven hundred seventy-one thousand, eight hundred thirty-six".