81553335112 has 32 divisors (see below), whose sum is σ = 155654870400. Its totient is φ = 40051440000.

The previous prime is 81553334969. The next prime is 81553335113. The reversal of 81553335112 is 21153335518.

It is not an unprimeable number, because it can be changed into a prime (81553335113) 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 7 ways as a sum of consecutive naturals, for example, 271764 + ... + 486787.

It is an arithmetic number, because the mean of its divisors is an integer number (4864214700).

Almost surely, 2^81553335112 is an apocalyptic number.

It is an amenable number.

81553335112 is a deficient number, since it is larger than the sum of its proper divisors (74101535288).

81553335112 is a wasteful number, since it uses less digits than its factorization.

81553335112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758797 (or 758793 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The spelling of 81553335112 in words is "eighty-one billion, five hundred fifty-three million, three hundred thirty-five thousand, one hundred twelve".