81701008608 has 144 divisors (see below), whose sum is σ = 220276143360. Its totient is φ = 26514738432.

The previous prime is 81701008561. The next prime is 81701008619. The reversal of 81701008608 is 80680010718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78633753 + ... + 78634791.

It is an arithmetic number, because the mean of its divisors is an integer number (1529695440).

Almost surely, 2^81701008608 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 81701008608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110138071680).

81701008608 is an abundant number, since it is smaller than the sum of its proper divisors (138575134752).

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

81701008608 is a wasteful number, since it uses less digits than its factorization.

81701008608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 39.

The spelling of 81701008608 in words is "eighty-one billion, seven hundred one million, eight thousand, six hundred eight".