181919283820 has 48 divisors (see below), whose sum is σ = 390215024640. Its totient is φ = 71209202624.

The previous prime is 181919283811. The next prime is 181919283827. The reversal of 181919283820 is 28382919181.

It is not an unprimeable number, because it can be changed into a prime (181919283827) 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 15 ways as a sum of consecutive naturals, for example, 12219141 + ... + 12234019.

It is an arithmetic number, because the mean of its divisors is an integer number (8129479680).

Almost surely, 2^181919283820 is an apocalyptic number.

181919283820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181919283820 is an abundant number, since it is smaller than the sum of its proper divisors (208295740820).

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

181919283820 is a wasteful number, since it uses less digits than its factorization.

181919283820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27942 (or 27940 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 52.

The spelling of 181919283820 in words is "one hundred eighty-one billion, nine hundred nineteen million, two hundred eighty-three thousand, eight hundred twenty".