81081176880 has 320 divisors, whose sum is σ = 293111239680. Its totient is φ = 18342297600.

The previous prime is 81081176819. The next prime is 81081176933. The reversal of 81081176880 is 8867118018.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2473236 + ... + 2505804.

It is an arithmetic number, because the mean of its divisors is an integer number (915972624).

Almost surely, 2^81081176880 is an apocalyptic number.

81081176880 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 81081176880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146555619840).

81081176880 is an abundant number, since it is smaller than the sum of its proper divisors (212030062800).

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

81081176880 is a wasteful number, since it uses less digits than its factorization.

81081176880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32660 (or 32654 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 48.

The spelling of 81081176880 in words is "eighty-one billion, eighty-one million, one hundred seventy-six thousand, eight hundred eighty".