81500965896 has 256 divisors, whose sum is σ = 248591646720. Its totient is φ = 21772800000.

The previous prime is 81500965883. The next prime is 81500965921. The reversal of 81500965896 is 69856900518.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29095696 + ... + 29098496.

It is an arithmetic number, because the mean of its divisors is an integer number (971061120).

Almost surely, 2^81500965896 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 81500965896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124295823360).

81500965896 is an abundant number, since it is smaller than the sum of its proper divisors (167090680824).

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

81500965896 is a wasteful number, since it uses less digits than its factorization.

81500965896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036 (or 3032 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 81500965896 in words is "eighty-one billion, five hundred million, nine hundred sixty-five thousand, eight hundred ninety-six".