81024245568 has 420 divisors, whose sum is σ = 280574374080. Its totient is φ = 23052169728.

The previous prime is 81024245557. The next prime is 81024245569. The reversal of 81024245568 is 86554242018.

81024245568 is a `hidden beast` number, since 8 + 1 + 0 + 2 + 42 + 45 + 568 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81024245569) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 77982393 + ... + 77983431.

It is an arithmetic number, because the mean of its divisors is an integer number (668034224).

Almost surely, 2^81024245568 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 81024245568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140287187040).

81024245568 is an abundant number, since it is smaller than the sum of its proper divisors (199550128512).

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

81024245568 is a wasteful number, since it uses less digits than its factorization.

81024245568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 81024245568 in words is "eighty-one billion, twenty-four million, two hundred forty-five thousand, five hundred sixty-eight".