81096956864 has 168 divisors, whose sum is σ = 205917119280. Its totient is φ = 31594590720.

The previous prime is 81096956839. The next prime is 81096956879. The reversal of 81096956864 is 46865969018.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81096956797 and 81096956806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4164302 + ... + 4183730.

Almost surely, 2^81096956864 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 81096956864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102958559640).

81096956864 is an abundant number, since it is smaller than the sum of its proper divisors (124820162416).

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

81096956864 is a wasteful number, since it uses less digits than its factorization.

81096956864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19488 (or 19449 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 62.

The spelling of 81096956864 in words is "eighty-one billion, ninety-six million, nine hundred fifty-six thousand, eight hundred sixty-four".