81813714855 has 8 divisors (see below), whose sum is σ = 130901943792. Its totient is φ = 43633981248.

The previous prime is 81813714817. The next prime is 81813714859. The reversal of 81813714855 is 55841731818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81813714855 - 2⁹ = 81813714343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81813714798 and 81813714807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81813714859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2727123814 + ... + 2727123843.

It is an arithmetic number, because the mean of its divisors is an integer number (16362742974).

Almost surely, 2^81813714855 is an apocalyptic number.

81813714855 is a deficient number, since it is larger than the sum of its proper divisors (49088228937).

81813714855 is a wasteful number, since it uses less digits than its factorization.

81813714855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5454247665.

The product of its digits is 1075200, while the sum is 51.

The spelling of 81813714855 in words is "eighty-one billion, eight hundred thirteen million, seven hundred fourteen thousand, eight hundred fifty-five".