81283555080 has 640 divisors, whose sum is σ = 345384103680. Its totient is φ = 16684185600.

The previous prime is 81283555033. The next prime is 81283555091. The reversal of 81283555080 is 8055538218.

81283555080 is a `hidden beast` number, since 8 + 12 + 8 + 3 + 5 + 550 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 10905355 + ... + 10912805.

It is an arithmetic number, because the mean of its divisors is an integer number (539662662).

Almost surely, 2^81283555080 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 81283555080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172692051840).

81283555080 is an abundant number, since it is smaller than the sum of its proper divisors (264100548600).

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

81283555080 is a wasteful number, since it uses less digits than its factorization.

81283555080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531 (or 7518 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The spelling of 81283555080 in words is "eighty-one billion, two hundred eighty-three million, five hundred fifty-five thousand, eighty".