8181551818 has 32 divisors (see below), whose sum is σ = 14196720960. Its totient is φ = 3494895360.

The previous prime is 8181551783. The next prime is 8181551839.

It is a happy number.

8181551818 is nontrivially palindromic in base 10.

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 15 ways as a sum of consecutive naturals, for example, 239428 + ... + 271456.

It is an arithmetic number, because the mean of its divisors is an integer number (443647530).

Almost surely, 2^8181551818 is an apocalyptic number.

8181551818 is a deficient number, since it is larger than the sum of its proper divisors (6015169142).

8181551818 is a wasteful number, since it uses less digits than its factorization.

8181551818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32742.

The product of its digits is 102400, while the sum is 46.

The square root of 8181551818 is about 90451.9309799409. The cubic root of 8181551818 is about 2015.0162914942.

The spelling of 8181551818 in words is "eight billion, one hundred eighty-one million, five hundred fifty-one thousand, eight hundred eighteen".