81580010511044 has 12 divisors (see below), whose sum is σ = 142767213445164. Its totient is φ = 40789378098144.

The previous prime is 81580010511011. The next prime is 81580010511119. The reversal of 81580010511044 is 44011501008518.

81580010511044 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 17986403317444 + 63593607193600 = 4241038^2 + 7974560^2 .

It is a super-2 number, since 2×81580010511044² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81580010510989 and 81580010511007.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 156496607 + ... + 157017030.

It is an arithmetic number, because the mean of its divisors is an integer number (11897267787097).

Almost surely, 2^{81580010511044} is an apocalyptic number.

It is an amenable number.

81580010511044 is a deficient number, since it is larger than the sum of its proper divisors (61187202934120).

81580010511044 is a wasteful number, since it uses less digits than its factorization.

81580010511044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313578694 (or 313578692 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 38.

The spelling of 81580010511044 in words is "eighty-one trillion, five hundred eighty billion, ten million, five hundred eleven thousand, forty-four".