581720520960 has 288 divisors, whose sum is σ = 2065919856000. Its totient is φ = 155003756544.

The previous prime is 581720520959. The next prime is 581720520989. The reversal of 581720520960 is 69025027185.

581720520960 is a `hidden beast` number, since 5 + 8 + 17 + 20 + 520 + 96 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49380351 + ... + 49392129.

Almost surely, 2^581720520960 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 581720520960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032959928000).

581720520960 is an abundant number, since it is smaller than the sum of its proper divisors (1484199335040).

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

581720520960 is a wasteful number, since it uses less digits than its factorization.

581720520960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13238 (or 13218 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 581720520960 in words is "five hundred eighty-one billion, seven hundred twenty million, five hundred twenty thousand, nine hundred sixty".