81788288718 has 16 divisors (see below), whose sum is σ = 167380684416. Its totient is φ = 26628745080.

The previous prime is 81788288711. The next prime is 81788288731.

81788288718 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81788288711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158504178 + ... + 158504693.

It is an arithmetic number, because the mean of its divisors is an integer number (10461292776).

Almost surely, 2^81788288718 is an apocalyptic number.

81788288718 is an abundant number, since it is smaller than the sum of its proper divisors (85592395698).

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

81788288718 is a wasteful number, since it uses less digits than its factorization.

81788288718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317008919.

The product of its digits is 25690112, while the sum is 66.

The spelling of 81788288718 in words is "eighty-one billion, seven hundred eighty-eight million, two hundred eighty-eight thousand, seven hundred eighteen".