80020781568 has 480 divisors, whose sum is σ = 296634514176. Its totient is φ = 20184367104.

The previous prime is 80020781563. The next prime is 80020781569. The reversal of 80020781568 is 86518702008.

80020781568 is a `hidden beast` number, since 8 + 0 + 0 + 2 + 0 + 7 + 81 + 568 = 666.

It is not an unprimeable number, because it can be changed into a prime (80020781563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9640396 + ... + 9648692.

Almost surely, 2^80020781568 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 80020781568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148317257088).

80020781568 is an abundant number, since it is smaller than the sum of its proper divisors (216613732608).

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

80020781568 is a wasteful number, since it uses less digits than its factorization.

80020781568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364 (or 8345 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 80020781568 in words is "eighty billion, twenty million, seven hundred eighty-one thousand, five hundred sixty-eight".