811990323939168 has 432 divisors, whose sum is σ = 2731454661525408. Its totient is φ = 227787228979200.

The previous prime is 811990323939149. The next prime is 811990323939169. The reversal of 811990323939168 is 861939323099118.

811990323939168 is a `hidden beast` number, since 8 + 1 + 1 + 9 + 90 + 3 + 2 + 393 + 91 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 811990323939096 and 811990323939105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811990323939169) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 24902605 + ... + 47372147.

It is an arithmetic number, because the mean of its divisors is an integer number (6322811716494).

Almost surely, 2^{811990323939168} is an apocalyptic number.

811990323939168 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811990323939168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365727330762704).

811990323939168 is an abundant number, since it is smaller than the sum of its proper divisors (1919464337586240).

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

811990323939168 is a wasteful number, since it uses less digits than its factorization.

811990323939168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22469659 (or 22469637 counting only the distinct ones).

The product of its (nonzero) digits is 136048896, while the sum is 72.

The spelling of 811990323939168 in words is "eight hundred eleven trillion, nine hundred ninety billion, three hundred twenty-three million, nine hundred thirty-nine thousand, one hundred sixty-eight".