81180076608 has 280 divisors, whose sum is σ = 258992836344. Its totient is φ = 25049088000.

The previous prime is 81180076577. The next prime is 81180076613. The reversal of 81180076608 is 80667008118.

It can be written as a sum of positive squares in 4 ways, for example, as 50808384 + 81129268224 = 7128^2 + 284832^2 .

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 39 ways as a sum of consecutive naturals, for example, 5368258 + ... + 5383358.

Almost surely, 2^81180076608 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 81180076608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129496418172).

81180076608 is an abundant number, since it is smaller than the sum of its proper divisors (177812759736).

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

81180076608 is a wasteful number, since it uses less digits than its factorization.

81180076608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15203 (or 15184 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 81180076608 in words is "eighty-one billion, one hundred eighty million, seventy-six thousand, six hundred eight".