81068294868 has 72 divisors (see below), whose sum is σ = 208812187584. Its totient is φ = 24460613760.

The previous prime is 81068294863. The next prime is 81068294887. The reversal of 81068294868 is 86849286018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068294861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218505 + ... + 458127.

It is an arithmetic number, because the mean of its divisors is an integer number (2900169272).

Almost surely, 2^81068294868 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 81068294868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104406093792).

81068294868 is an abundant number, since it is smaller than the sum of its proper divisors (127743892716).

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

81068294868 is a wasteful number, since it uses less digits than its factorization.

81068294868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239885 (or 239872 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 60.

The spelling of 81068294868 in words is "eighty-one billion, sixty-eight million, two hundred ninety-four thousand, eight hundred sixty-eight".