81348718880 has 192 divisors, whose sum is σ = 237670070400. Its totient is φ = 25868574720.

The previous prime is 81348718879. The next prime is 81348718909. The reversal of 81348718880 is 8881784318.

It is a super-2 number, since 2×81348718880² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341156 + ... + 528284.

It is an arithmetic number, because the mean of its divisors is an integer number (1237864950).

Almost surely, 2^81348718880 is an apocalyptic number.

81348718880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81348718880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118835035200).

81348718880 is an abundant number, since it is smaller than the sum of its proper divisors (156321351520).

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

81348718880 is a wasteful number, since it uses less digits than its factorization.

81348718880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187187 (or 187179 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 56.

The spelling of 81348718880 in words is "eighty-one billion, three hundred forty-eight million, seven hundred eighteen thousand, eight hundred eighty".