81542990058 has 64 divisors (see below), whose sum is σ = 176847390720. Its totient is φ = 24965644032.

The previous prime is 81542990021. The next prime is 81542990083. The reversal of 81542990058 is 85009924518.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5514591 + ... + 5529357.

It is an arithmetic number, because the mean of its divisors is an integer number (2763240480).

Almost surely, 2^81542990058 is an apocalyptic number.

81542990058 is an abundant number, since it is smaller than the sum of its proper divisors (95304400662).

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

81542990058 is a wasteful number, since it uses less digits than its factorization.

81542990058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16091.

The product of its (nonzero) digits is 1036800, while the sum is 51.

The spelling of 81542990058 in words is "eighty-one billion, five hundred forty-two million, nine hundred ninety thousand, fifty-eight".