8191786122 has 336 divisors, whose sum is σ = 22339695840. Its totient is φ = 2230949952.

The previous prime is 8191785997. The next prime is 8191786151. The reversal of 8191786122 is 2216871918.

8191786122 is a `hidden beast` number, since 8 + 19 + 17 + 8 + 612 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 190506633 + ... + 190506675.

It is an arithmetic number, because the mean of its divisors is an integer number (66487190).

Almost surely, 2^8191786122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8191786122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11169847920).

8191786122 is an abundant number, since it is smaller than the sum of its proper divisors (14147909718).

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

8191786122 is a wasteful number, since it uses less digits than its factorization.

8191786122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 103 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 8191786122 is about 90508.4864639775. The cubic root of 8191786122 is about 2015.8561360988.

The spelling of 8191786122 in words is "eight billion, one hundred ninety-one million, seven hundred eighty-six thousand, one hundred twenty-two".