81030000068 has 6 divisors (see below), whose sum is σ = 141802500126. Its totient is φ = 40515000032.

The previous prime is 81030000059. The next prime is 81030000083. The reversal of 81030000068 is 86000003018.

It can be written as a sum of positive squares in only one way, i.e., 58077144064 + 22952856004 = 240992^2 + 151502^2 .

It is a super-2 number, since 2×81030000068² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128750005 + ... + 10128750012.

It is an arithmetic number, because the mean of its divisors is an integer number (23633750021).

Almost surely, 2^81030000068 is an apocalyptic number.

It is an amenable number.

81030000068 is a deficient number, since it is larger than the sum of its proper divisors (60772500058).

81030000068 is a wasteful number, since it uses less digits than its factorization.

81030000068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20257500021 (or 20257500019 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 81030000068 in words is "eighty-one billion, thirty million, sixty-eight", and thus it is an aban number and an uban number.