81888799788818 has 8 divisors (see below), whose sum is σ = 133999854199920. Its totient is φ = 37222181722180.

The previous prime is 81888799788767. The next prime is 81888799788863.

81888799788818 is nontrivially palindromic in base 10.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861109086088 + ... + 1861109086131.

It is an arithmetic number, because the mean of its divisors is an integer number (16749981774990).

Almost surely, 2^{81888799788818} is an apocalyptic number.

81888799788818 is a deficient number, since it is larger than the sum of its proper divisors (52111054411102).

81888799788818 is a wasteful number, since it uses less digits than its factorization.

81888799788818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722218172232.

The product of its digits is 66588770304, while the sum is 98.

The spelling of 81888799788818 in words is "eighty-one trillion, eight hundred eighty-eight billion, seven hundred ninety-nine million, seven hundred eighty-eight thousand, eight hundred eighteen".