8161798986 has 24 divisors (see below), whose sum is σ = 19291525344. Its totient is φ = 2473272360.

The previous prime is 8161798951. The next prime is 8161798987. The reversal of 8161798986 is 6898971618.

8161798986 is a `hidden beast` number, since 8 + 1 + 617 + 9 + 8 + 9 + 8 + 6 = 666.

It is a super-2 number, since 2×8161798986² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8161798987) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 20610406 + ... + 20610801.

It is an arithmetic number, because the mean of its divisors is an integer number (803813556).

Almost surely, 2^8161798986 is an apocalyptic number.

8161798986 is an abundant number, since it is smaller than the sum of its proper divisors (11129726358).

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

8161798986 is a wasteful number, since it uses less digits than its factorization.

8161798986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41221226 (or 41221223 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 8161798986 is about 90342.6753312077. The cubic root of 8161798986 is about 2013.3933576087.

The spelling of 8161798986 in words is "eight billion, one hundred sixty-one million, seven hundred ninety-eight thousand, nine hundred eighty-six".