81055168896 has 256 divisors, whose sum is σ = 241351992000. Its totient is φ = 24072781824.

The previous prime is 81055168891. The next prime is 81055168897. The reversal of 81055168896 is 69886155018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81055168891) 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, 24464136 + ... + 24467448.

Almost surely, 2^81055168896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81055168896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120675996000).

81055168896 is an abundant number, since it is smaller than the sum of its proper divisors (160296823104).

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

81055168896 is a wasteful number, since it uses less digits than its factorization.

81055168896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398 (or 3360 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 57.

The spelling of 81055168896 in words is "eighty-one billion, fifty-five million, one hundred sixty-eight thousand, eight hundred ninety-six".