81326359296 has 432 divisors, whose sum is σ = 305585227584. Its totient is φ = 20186136576.

The previous prime is 81326359291. The next prime is 81326359321. The reversal of 81326359296 is 69295362318.

It is a super-2 number, since 2×81326359296² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81326359291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3552880 + ... + 3575696.

It is an arithmetic number, because the mean of its divisors is an integer number (707373212).

Almost surely, 2^81326359296 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 81326359296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152792613792).

81326359296 is an abundant number, since it is smaller than the sum of its proper divisors (224258868288).

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

81326359296 is a wasteful number, since it uses less digits than its factorization.

81326359296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22876 (or 22859 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 81326359296 in words is "eighty-one billion, three hundred twenty-six million, three hundred fifty-nine thousand, two hundred ninety-six".