81117274208812 has 12 divisors (see below), whose sum is σ = 141958771324720. Its totient is φ = 40557625258896.

The previous prime is 81117274208809. The next prime is 81117274208813. The reversal of 81117274208812 is 21880247271118.

It is a self number, because there is not a number n which added to its sum of digits gives 81117274208812.

It is not an unprimeable number, because it can be changed into a prime (81117274208813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252780987 + ... + 253101682.

Almost surely, 2^{81117274208812} is an apocalyptic number.

It is an amenable number.

81117274208812 is a deficient number, since it is larger than the sum of its proper divisors (60841497115908).

81117274208812 is a wasteful number, since it uses less digits than its factorization.

81117274208812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505922760 (or 505922758 counting only the distinct ones).

The product of its (nonzero) digits is 802816, while the sum is 52.

The spelling of 81117274208812 in words is "eighty-one trillion, one hundred seventeen billion, two hundred seventy-four million, two hundred eight thousand, eight hundred twelve".