1818181818 has 48 divisors (see below), whose sum is σ = 4050813312. Its totient is φ = 589032000.

The previous prime is 1818181817. The next prime is 1818181823. The reversal of 1818181818 is 8181818181.

1818181818 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

1818181818 is an undulating number in base 10.

1818181818 is a modest number, since divided by 181818 gives 1818 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1818181817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195453 + ... + 204543.

It is an arithmetic number, because the mean of its divisors is an integer number (84391944).

Almost surely, 2^1818181818 is an apocalyptic number.

1818181818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1818181818 is an abundant number, since it is smaller than the sum of its proper divisors (2232631494).

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

1818181818 is a wasteful number, since it uses less digits than its factorization.

1818181818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9411 (or 9408 counting only the distinct ones).

The product of its digits is 32768, while the sum is 45.

The square root of 1818181818 is about 42640.1432689901. The cubic root of 1818181818 is about 1220.5224444296.

Adding to 1818181818 its reverse (8181818181), we get a palindrome (9999999999).

It can be divided in two parts, 18181 and 81818, that added together give a palindrome (99999).

The spelling of 1818181818 in words is "one billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred eighteen".