81406005327 has 6 divisors (see below), whose sum is σ = 117586452152. Its totient is φ = 54270670212.

The previous prime is 81406005311. The next prime is 81406005337. The reversal of 81406005327 is 72350060418.

81406005327 is a `hidden beast` number, since 8 + 1 + 40 + 600 + 5 + 3 + 2 + 7 = 666.

It is not a de Polignac number, because 81406005327 - 2⁴ = 81406005311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81406005291 and 81406005300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81406005337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4522555843 + ... + 4522555860.

Almost surely, 2^81406005327 is an apocalyptic number.

81406005327 is a deficient number, since it is larger than the sum of its proper divisors (36180446825).

81406005327 is a wasteful number, since it uses less digits than its factorization.

81406005327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9045111709 (or 9045111706 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 81406005327 in words is "eighty-one billion, four hundred six million, five thousand, three hundred twenty-seven".