181818403820 has 48 divisors (see below), whose sum is σ = 384074460000. Its totient is φ = 72298297344.

The previous prime is 181818403777. The next prime is 181818403889. The reversal of 181818403820 is 28304818181.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4902587 + ... + 4939533.

It is an arithmetic number, because the mean of its divisors is an integer number (8001551250).

Almost surely, 2^181818403820 is an apocalyptic number.

181818403820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181818403820 is an abundant number, since it is smaller than the sum of its proper divisors (202256056180).

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

181818403820 is a wasteful number, since it uses less digits than its factorization.

181818403820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38402 (or 38400 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 44.

The spelling of 181818403820 in words is "one hundred eighty-one billion, eight hundred eighteen million, four hundred three thousand, eight hundred twenty".