81104739775488 has 3168 divisors, whose sum is σ = 307021930225920. Its totient is φ = 21069103104000.

The previous prime is 81104739775487. The next prime is 81104739775511. The reversal of 81104739775488 is 88457793740118.

81104739775488 is a `hidden beast` number, since 8 + 1 + 1 + 0 + 4 + 7 + 3 + 9 + 77 + 548 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (3168).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81104739775483) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1142320278493 + ... + 1142320278563.

Almost surely, 2^{81104739775488} is an apocalyptic number.

81104739775488 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81104739775488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153510965112960).

81104739775488 is an abundant number, since it is smaller than the sum of its proper divisors (225917190450432).

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

81104739775488 is a wasteful number, since it uses less digits than its factorization.

81104739775488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 379330560, while the sum is 72.

The spelling of 81104739775488 in words is "eighty-one trillion, one hundred four billion, seven hundred thirty-nine million, seven hundred seventy-five thousand, four hundred eighty-eight".