81095329568 has 192 divisors, whose sum is σ = 193454811648. Its totient is φ = 33033093120.

The previous prime is 81095329537. The next prime is 81095329577. The reversal of 81095329568 is 86592359018.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10402280 + ... + 10410072.

It is an arithmetic number, because the mean of its divisors is an integer number (1007577144).

Almost surely, 2^81095329568 is an apocalyptic number.

81095329568 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 81095329568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96727405824).

81095329568 is an abundant number, since it is smaller than the sum of its proper divisors (112359482080).

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

81095329568 is a wasteful number, since it uses less digits than its factorization.

81095329568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915 (or 7907 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 81095329568 in words is "eighty-one billion, ninety-five million, three hundred twenty-nine thousand, five hundred sixty-eight".