8081391561960 has 256 divisors, whose sum is σ = 25514847590400. Its totient is φ = 2043733773312.

The previous prime is 8081391561953. The next prime is 8081391561977. The reversal of 8081391561960 is 691651931808.

It is a self number, because there is not a number n which added to its sum of digits gives 8081391561960.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 290401567 + ... + 290429393.

It is an arithmetic number, because the mean of its divisors is an integer number (99667373400).

Almost surely, 2^{8081391561960} 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 8081391561960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12757423795200).

8081391561960 is an abundant number, since it is smaller than the sum of its proper divisors (17433456028440).

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

8081391561960 is a wasteful number, since it uses less digits than its factorization.

8081391561960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28760 (or 28756 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 57.

The spelling of 8081391561960 in words is "eight trillion, eighty-one billion, three hundred ninety-one million, five hundred sixty-one thousand, nine hundred sixty".