8189779818 has 64 divisors (see below), whose sum is σ = 19147871232. Its totient is φ = 2307598080.

The previous prime is 8189779813. The next prime is 8189779823.

8189779818 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (8189779813) and next prime (8189779823).

It is a super-2 number, since 2×8189779818² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (8189779811) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 49155 + ... + 137097.

It is an arithmetic number, because the mean of its divisors is an integer number (299185488).

Almost surely, 2^8189779818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8189779818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9573935616).

8189779818 is an abundant number, since it is smaller than the sum of its proper divisors (10958091414).

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

8189779818 is a wasteful number, since it uses less digits than its factorization.

8189779818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88059.

The product of its digits is 16257024, while the sum is 66.

The square root of 8189779818 is about 90497.4022721094. The cubic root of 8189779818 is about 2015.6915504843.

The spelling of 8189779818 in words is "eight billion, one hundred eighty-nine million, seven hundred seventy-nine thousand, eight hundred eighteen".