81738594198 has 24 divisors (see below), whose sum is σ = 177110497200. Its totient is φ = 27244627344.

The previous prime is 81738594193. The next prime is 81738594199. The reversal of 81738594198 is 89149583718.

81738594198 is a `hidden beast` number, since 8 + 1 + 7 + 38 + 594 + 1 + 9 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81738594191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214668 + ... + 457776.

It is an arithmetic number, because the mean of its divisors is an integer number (7379604050).

Almost surely, 2^81738594198 is an apocalyptic number.

81738594198 is an abundant number, since it is smaller than the sum of its proper divisors (95371903002).

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

81738594198 is a wasteful number, since it uses less digits than its factorization.

81738594198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261796 (or 261793 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The spelling of 81738594198 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred ninety-four thousand, one hundred ninety-eight".