81081176881 has 16 divisors (see below), whose sum is σ = 89114653440. Its totient is φ = 73463604480.

The previous prime is 81081176819. The next prime is 81081176933. The reversal of 81081176881 is 18867118018.

It is a cyclic number.

It is not a de Polignac number, because 81081176881 - 2¹⁵ = 81081144113 is a prime.

It is a super-2 number, since 2×81081176881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81081116881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 783051 + ... + 880528.

It is an arithmetic number, because the mean of its divisors is an integer number (5569665840).

Almost surely, 2^81081176881 is an apocalyptic number.

It is an amenable number.

81081176881 is a deficient number, since it is larger than the sum of its proper divisors (8033476559).

81081176881 is a wasteful number, since it uses less digits than its factorization.

81081176881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663704.

The product of its (nonzero) digits is 172032, while the sum is 49.

The spelling of 81081176881 in words is "eighty-one billion, eighty-one million, one hundred seventy-six thousand, eight hundred eighty-one".