81340068080 has 20 divisors (see below), whose sum is σ = 189115658472. Its totient is φ = 32536027200.

The previous prime is 81340068071. The next prime is 81340068127. The reversal of 81340068080 is 8086004318.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508375346 + ... + 508375505.

Almost surely, 2^81340068080 is an apocalyptic number.

81340068080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81340068080 is an abundant number, since it is smaller than the sum of its proper divisors (107775590392).

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

81340068080 is a wasteful number, since it uses less digits than its factorization.

81340068080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016750864 (or 1016750858 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 81340068080 in words is "eighty-one billion, three hundred forty million, sixty-eight thousand, eighty".