81341009568 has 384 divisors, whose sum is σ = 299895805440. Its totient is φ = 20872028160.

The previous prime is 81341009527. The next prime is 81341009569. The reversal of 81341009568 is 86590014318.

81341009568 is a `hidden beast` number, since 81 + 3 + 4 + 1 + 0 + 0 + 9 + 568 = 666.

It is not an unprimeable number, because it can be changed into a prime (81341009569) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2895108 + ... + 2923068.

It is an arithmetic number, because the mean of its divisors is an integer number (780978660).

Almost surely, 2^81341009568 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 81341009568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149947902720).

81341009568 is an abundant number, since it is smaller than the sum of its proper divisors (218554795872).

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

81341009568 is a wasteful number, since it uses less digits than its factorization.

81341009568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28037 (or 28023 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 81341009568 in words is "eighty-one billion, three hundred forty-one million, nine thousand, five hundred sixty-eight".