818181818181810 has 160 divisors (see below), whose sum is σ = 2209682651616000. Its totient is φ = 217221950050560.

The previous prime is 818181818181797. The next prime is 818181818181811. The reversal of 818181818181810 is 18181818181818.

It is a super-2 number, since 2×818181818181810² (a number of 31 digits) contains 22 as substring.

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

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

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 899545365 + ... + 900454455.

It is an arithmetic number, because the mean of its divisors is an integer number (13810516572600).

Almost surely, 2^{818181818181810} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818181818181810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104841325808000).

818181818181810 is an abundant number, since it is smaller than the sum of its proper divisors (1391500833434190).

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

818181818181810 is a wasteful number, since it uses less digits than its factorization.

818181818181810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913998 (or 913989 counting only the distinct ones).

The product of its (nonzero) digits is 2097152, while the sum is 63.

818181818181810 divided by its reverse (18181818181818) gives a triangular number (45 = T₉).

The spelling of 818181818181810 in words is "eight hundred eighteen trillion, one hundred eighty-one billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred ten".