81110557344 has 48 divisors (see below), whose sum is σ = 214905102048. Its totient is φ = 26784168192.

The previous prime is 81110557327. The next prime is 81110557397. The reversal of 81110557344 is 44375501118.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3937867 + ... + 3958410.

It is an arithmetic number, because the mean of its divisors is an integer number (4477189626).

Almost surely, 2^81110557344 is an apocalyptic number.

It is an amenable number.

81110557344 is an abundant number, since it is smaller than the sum of its proper divisors (133794544704).

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

81110557344 is a wasteful number, since it uses less digits than its factorization.

81110557344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7896397 (or 7896389 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 81110557344 in words is "eighty-one billion, one hundred ten million, five hundred fifty-seven thousand, three hundred forty-four".