81738334116 has 60 divisors (see below), whose sum is σ = 213972287452. Its totient is φ = 27208861632.

The previous prime is 81738334081. The next prime is 81738334123. The reversal of 81738334116 is 61143383718.

It can be written as a sum of positive squares in 2 ways, for example, as 52052422500 + 29685911616 = 228150^2 + 172296^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 65406 + ... + 409578.

Almost surely, 2^81738334116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81738334116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106986143726).

81738334116 is an abundant number, since it is smaller than the sum of its proper divisors (132233953336).

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

81738334116 is a wasteful number, since it uses less digits than its factorization.

81738334116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344922 (or 344911 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 81738334116 in words is "eighty-one billion, seven hundred thirty-eight million, three hundred thirty-four thousand, one hundred sixteen".