81489375582 has 8 divisors (see below), whose sum is σ = 162978751176. Its totient is φ = 27163125192.

The previous prime is 81489375533. The next prime is 81489375593. The reversal of 81489375582 is 28557398418.

It is a sphenic number, since it is the product of 3 distinct primes.

81489375582 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6790781293 + ... + 6790781304.

It is an arithmetic number, because the mean of its divisors is an integer number (20372343897).

Almost surely, 2^81489375582 is an apocalyptic number.

81489375582 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81489375582 is a wasteful number, since it uses less digits than its factorization.

81489375582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13581562602.

The product of its digits is 19353600, while the sum is 60.

The spelling of 81489375582 in words is "eighty-one billion, four hundred eighty-nine million, three hundred seventy-five thousand, five hundred eighty-two".