81073582053912 has 128 divisors (see below), whose sum is σ = 257770598745600. Its totient is φ = 23128407287424.

The previous prime is 81073582053883. The next prime is 81073582053917. The reversal of 81073582053912 is 21935028537018.

81073582053912 is a `hidden beast` number, since 8 + 1 + 0 + 7 + 3 + 582 + 0 + 53 + 9 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073582053917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40069398 + ... + 42044069.

It is an arithmetic number, because the mean of its divisors is an integer number (2013832802700).

Almost surely, 2^{81073582053912} is an apocalyptic number.

It is an amenable number.

81073582053912 is an abundant number, since it is smaller than the sum of its proper divisors (176697016691688).

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

81073582053912 is a wasteful number, since it uses less digits than its factorization.

81073582053912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82114142 (or 82114132 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 81073582053912 in words is "eighty-one trillion, seventy-three billion, five hundred eighty-two million, fifty-three thousand, nine hundred twelve".