81027425547 has 10 divisors (see below), whose sum is σ = 121040969148. Its totient is φ = 54018283644.

The previous prime is 81027425539. The next prime is 81027425573. The reversal of 81027425547 is 74552472018.

81027425547 is a `hidden beast` number, since 8 + 10 + 2 + 74 + 25 + 547 = 666.

It is not a de Polignac number, because 81027425547 - 2³ = 81027425539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81027425447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 500169213 + ... + 500169374.

Almost surely, 2^81027425547 is an apocalyptic number.

81027425547 is a deficient number, since it is larger than the sum of its proper divisors (40013543601).

81027425547 is a wasteful number, since it uses less digits than its factorization.

81027425547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000338599 (or 1000338590 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 45.

The spelling of 81027425547 in words is "eighty-one billion, twenty-seven million, four hundred twenty-five thousand, five hundred forty-seven".