81109419848 has 36 divisors (see below), whose sum is σ = 161579563065. Its totient is φ = 38162694528.

The previous prime is 81109419847. The next prime is 81109419893. The reversal of 81109419848 is 84891490118.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 74233361764 + 6876058084 = 272458^2 + 82922^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201382.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81109419848.

It is not an unprimeable number, because it can be changed into a prime (81109419847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13691015 + ... + 13696937.

Almost surely, 2^81109419848 is an apocalyptic number.

It is an amenable number.

81109419848 is a deficient number, since it is larger than the sum of its proper divisors (80470143217).

81109419848 is an frugal number, since it uses more digits than its factorization.

81109419848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11886 (or 5942 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 53.

The spelling of 81109419848 in words is "eighty-one billion, one hundred nine million, four hundred nineteen thousand, eight hundred forty-eight".