81541844523024 has 80 divisors (see below), whose sum is σ = 216320248784640. Its totient is φ = 26455329699840.

The previous prime is 81541844523019. The next prime is 81541844523043. The reversal of 81541844523024 is 42032544814518.

It is a super-2 number, since 2×81541844523024² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99438169 + ... + 100254840.

It is an arithmetic number, because the mean of its divisors is an integer number (2704003109808).

Almost surely, 2^{81541844523024} is an apocalyptic number.

It is an amenable number.

81541844523024 is an abundant number, since it is smaller than the sum of its proper divisors (134778404261616).

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

81541844523024 is a wasteful number, since it uses less digits than its factorization.

81541844523024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199693248 (or 199693242 counting only the distinct ones).

The product of its (nonzero) digits is 4915200, while the sum is 51.

The spelling of 81541844523024 in words is "eighty-one trillion, five hundred forty-one billion, eight hundred forty-four million, five hundred twenty-three thousand, twenty-four".