818181818181819 has 192 divisors, whose sum is σ = 1468343680900096. Its totient is φ = 427495864320000.

The previous prime is 818181818181811. The next prime is 818181818181839. The reversal of 818181818181819 is 918181818181818.

It is a happy number.

It is not a de Polignac number, because 818181818181819 - 2³ = 818181818181811 is a prime.

It is a super-2 number, since 2×818181818181819² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (818181818181811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 89999095464 + ... + 89999104554.

Almost surely, 2^{818181818181819} is an apocalyptic number.

818181818181819 is a deficient number, since it is larger than the sum of its proper divisors (650161862718277).

818181818181819 is a wasteful number, since it uses less digits than its factorization.

818181818181819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11730 (or 11727 counting only the distinct ones).

The product of its digits is 18874368, while the sum is 72.

Subtracting 818181818181819 from its reverse (918181818181818), we obtain a palindrome (99999999999999).

The spelling of 818181818181819 in words is "eight hundred eighteen trillion, one hundred eighty-one billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred nineteen".