81598811748 has 12 divisors (see below), whose sum is σ = 190397227440. Its totient is φ = 27199603912.

The previous prime is 81598811747. The next prime is 81598811753. The reversal of 81598811748 is 84711889518.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 81598811691 and 81598811700.

It is not an unprimeable number, because it can be changed into a prime (81598811747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3399950478 + ... + 3399950501.

It is an arithmetic number, because the mean of its divisors is an integer number (15866435620).

Almost surely, 2^81598811748 is an apocalyptic number.

It is an amenable number.

81598811748 is an abundant number, since it is smaller than the sum of its proper divisors (108798415692).

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

81598811748 is a wasteful number, since it uses less digits than its factorization.

81598811748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6799900986 (or 6799900984 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 60.

The spelling of 81598811748 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred eleven thousand, seven hundred forty-eight".