81381544098 has 8 divisors (see below), whose sum is σ = 162763088208. Its totient is φ = 27127181364.

The previous prime is 81381544081. The next prime is 81381544103. The reversal of 81381544098 is 89044518318.

It is a sphenic number, since it is the product of 3 distinct primes.

81381544098 is an admirable number.

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 81381544098.

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 3 ways as a sum of consecutive naturals, for example, 6781795336 + ... + 6781795347.

It is an arithmetic number, because the mean of its divisors is an integer number (20345386026).

Almost surely, 2^81381544098 is an apocalyptic number.

81381544098 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81381544098 is a wasteful number, since it uses less digits than its factorization.

81381544098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13563590688.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 81381544098 in words is "eighty-one billion, three hundred eighty-one million, five hundred forty-four thousand, ninety-eight".