81571144048 has 20 divisors (see below), whose sum is σ = 158382530280. Its totient is φ = 40698233024.

The previous prime is 81571144027. The next prime is 81571144049. The reversal of 81571144048 is 84044117518.

It is a junction number, because it is equal to n+sod(n) for n = 81571143995 and 81571144013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81571144049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5450983 + ... + 5465926.

It is an arithmetic number, because the mean of its divisors is an integer number (7919126514).

Almost surely, 2^81571144048 is an apocalyptic number.

It is an amenable number.

81571144048 is a deficient number, since it is larger than the sum of its proper divisors (76811386232).

81571144048 is a wasteful number, since it uses less digits than its factorization.

81571144048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917384 (or 10917378 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 43.

The spelling of 81571144048 in words is "eighty-one billion, five hundred seventy-one million, one hundred forty-four thousand, forty-eight".