81489375567 has 16 divisors (see below), whose sum is σ = 125973914880. Its totient is φ = 51964239096.

The previous prime is 81489375533. The next prime is 81489375593. The reversal of 81489375567 is 76557398418.

81489375567 is a `hidden beast` number, since 8 + 1 + 48 + 9 + 37 + 556 + 7 = 666.

It is not a de Polignac number, because 81489375567 - 2¹¹ = 81489373519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81489375167) 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 15 ways as a sum of consecutive naturals, for example, 65610793 + ... + 65612034.

It is an arithmetic number, because the mean of its divisors is an integer number (7873369680).

Almost surely, 2^81489375567 is an apocalyptic number.

81489375567 is a deficient number, since it is larger than the sum of its proper divisors (44484539313).

81489375567 is a wasteful number, since it uses less digits than its factorization.

81489375567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131222859 (or 131222853 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 63.

The spelling of 81489375567 in words is "eighty-one billion, four hundred eighty-nine million, three hundred seventy-five thousand, five hundred sixty-seven".