81412854885 has 24 divisors (see below), whose sum is σ = 141194634360. Its totient is φ = 43395875712.

The previous prime is 81412854877. The next prime is 81412854899. The reversal of 81412854885 is 58845821418.

81412854885 is a `hidden beast` number, since 8 + 1 + 4 + 12 + 8 + 548 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14295071844 + 67117783041 = 119562^2 + 259071^2 .

It is not a de Polignac number, because 81412854885 - 2³ = 81412854877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425134 + ... + 586143.

It is an arithmetic number, because the mean of its divisors is an integer number (5883109765).

Almost surely, 2^81412854885 is an apocalyptic number.

It is an amenable number.

81412854885 is a deficient number, since it is larger than the sum of its proper divisors (59781779475).

81412854885 is a wasteful number, since it uses less digits than its factorization.

81412854885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013077 (or 1013074 counting only the distinct ones).

The product of its digits is 3276800, while the sum is 54.

The spelling of 81412854885 in words is "eighty-one billion, four hundred twelve million, eight hundred fifty-four thousand, eight hundred eighty-five".