81330445080 has 288 divisors, whose sum is σ = 273195795600. Its totient is φ = 20977684992.

The previous prime is 81330445067. The next prime is 81330445211. The reversal of 81330445080 is 8054403318.

81330445080 is a `hidden beast` number, since 8 + 133 + 0 + 445 + 0 + 80 = 666.

It is a super-2 number, since 2×81330445080² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 71 ways as a sum of consecutive naturals, for example, 95345934 + ... + 95346786.

Almost surely, 2^81330445080 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 81330445080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136597897800).

81330445080 is an abundant number, since it is smaller than the sum of its proper divisors (191865350520).

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

81330445080 is a wasteful number, since it uses less digits than its factorization.

81330445080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 81330445080 its reverse (8054403318), we get a palindrome (89384848398).

The spelling of 81330445080 in words is "eighty-one billion, three hundred thirty million, four hundred forty-five thousand, eighty".