81434058558 has 32 divisors (see below), whose sum is σ = 173366438400. Its totient is φ = 25427071296.

The previous prime is 81434058523. The next prime is 81434058599. The reversal of 81434058558 is 85585043418.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81434058558.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4002966 + ... + 4023257.

It is an arithmetic number, because the mean of its divisors is an integer number (5417701200).

Almost surely, 2^81434058558 is an apocalyptic number.

81434058558 is an abundant number, since it is smaller than the sum of its proper divisors (91932379842).

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

81434058558 is a wasteful number, since it uses less digits than its factorization.

81434058558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8026336.

The product of its (nonzero) digits is 3072000, while the sum is 51.

The spelling of 81434058558 in words is "eighty-one billion, four hundred thirty-four million, fifty-eight thousand, five hundred fifty-eight".