81398722789318 has 8 divisors (see below), whose sum is σ = 133197910018920. Its totient is φ = 36999419449680.

The previous prime is 81398722789313. The next prime is 81398722789337.

81398722789318 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81398722789313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849970972463 + ... + 1849970972506.

It is an arithmetic number, because the mean of its divisors is an integer number (16649738752365).

Almost surely, 2^{81398722789318} is an apocalyptic number.

81398722789318 is a deficient number, since it is larger than the sum of its proper divisors (51799187229602).

81398722789318 is a wasteful number, since it uses less digits than its factorization.

81398722789318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699941944982.

The product of its digits is 585252864, while the sum is 76.

The spelling of 81398722789318 in words is "eighty-one trillion, three hundred ninety-eight billion, seven hundred twenty-two million, seven hundred eighty-nine thousand, three hundred eighteen".