81814868127 has 16 divisors (see below), whose sum is σ = 121221767680. Its totient is φ = 54536695416.

The previous prime is 81814868123. The next prime is 81814868137. The reversal of 81814868127 is 72186841818.

81814868127 is a `hidden beast` number, since 8 + 1 + 81 + 486 + 81 + 2 + 7 = 666.

It is not a de Polignac number, because 81814868127 - 2² = 81814868123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81814868123) 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, 52548 + ... + 407910.

It is an arithmetic number, because the mean of its divisors is an integer number (7576360480).

Almost surely, 2^81814868127 is an apocalyptic number.

81814868127 is a deficient number, since it is larger than the sum of its proper divisors (39406899553).

81814868127 is a wasteful number, since it uses less digits than its factorization.

81814868127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363899 (or 363893 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 54.

The spelling of 81814868127 in words is "eighty-one billion, eight hundred fourteen million, eight hundred sixty-eight thousand, one hundred twenty-seven".