814116781081 has 4 divisors (see below), whose sum is σ = 814884092964. Its totient is φ = 813349469200.

The previous prime is 814116781073. The next prime is 814116781199. The reversal of 814116781081 is 180187611418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180187611418 = 2 ⋅90093805709.

It can be written as a sum of positive squares in 2 ways, for example, as 324034177600 + 490082603481 = 569240^2 + 700059^2 .

It is a cyclic number.

It is not a de Polignac number, because 814116781081 - 2³ = 814116781073 is a prime.

It is a super-2 number, since 2×814116781081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (814116782081) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 383654350 + ... + 383656471.

It is an arithmetic number, because the mean of its divisors is an integer number (203721023241).

Almost surely, 2^814116781081 is an apocalyptic number.

It is an amenable number.

814116781081 is a deficient number, since it is larger than the sum of its proper divisors (767311883).

814116781081 is a wasteful number, since it uses less digits than its factorization.

814116781081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767311882.

The product of its (nonzero) digits is 86016, while the sum is 46.

The spelling of 814116781081 in words is "eight hundred fourteen billion, one hundred sixteen million, seven hundred eighty-one thousand, eighty-one".