81412528305 has 32 divisors (see below), whose sum is σ = 132499027584. Its totient is φ = 42679003136.

The previous prime is 81412528279. The next prime is 81412528313. The reversal of 81412528305 is 50382521418.

It is a cyclic number.

It is not a de Polignac number, because 81412528305 - 2²⁰ = 81411479729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79297 + ... + 411233.

It is an arithmetic number, because the mean of its divisors is an integer number (4140594612).

Almost surely, 2^81412528305 is an apocalyptic number.

It is an amenable number.

81412528305 is a deficient number, since it is larger than the sum of its proper divisors (51086499279).

81412528305 is a wasteful number, since it uses less digits than its factorization.

81412528305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332225.

The product of its (nonzero) digits is 76800, while the sum is 39.

The spelling of 81412528305 in words is "eighty-one billion, four hundred twelve million, five hundred twenty-eight thousand, three hundred five".