81194488449118 has 48 divisors (see below), whose sum is σ = 135876558399120. Its totient is φ = 36353535356160.

The previous prime is 81194488449089. The next prime is 81194488449197.

81194488449118 is nontrivially palindromic in base 10.

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 23 ways as a sum of consecutive naturals, for example, 283423480 + ... + 283709812.

It is an arithmetic number, because the mean of its divisors is an integer number (2830761633315).

Almost surely, 2^{81194488449118} is an apocalyptic number.

81194488449118 is a deficient number, since it is larger than the sum of its proper divisors (54682069950002).

81194488449118 is a wasteful number, since it uses less digits than its factorization.

81194488449118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303913 (or 303902 counting only the distinct ones).

The product of its digits is 84934656, while the sum is 70.

The spelling of 81194488449118 in words is "eighty-one trillion, one hundred ninety-four billion, four hundred eighty-eight million, four hundred forty-nine thousand, one hundred eighteen".