581720520968 has 8 divisors (see below), whose sum is σ = 1090725976830.
Its totient is φ = 290860260480.
The previous prime is 581720520959. The next prime is 581720520989. The reversal of 581720520968 is 869025027185.
It can be written as a sum of positive squares in only one way, i.e., 369053820004 + 212666700964 = 607498^2 + 461158^2
It is a tau number, because it is divible by the number of its divisors (8).
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36357532553 + ... + 36357532568.
Almost surely, 2581720520968 is an apocalyptic number.
It is an amenable number.
581720520968 is a deficient number, since it is larger than the sum of its proper divisors (509005455862).
581720520968 is a wasteful number, since it uses less digits than its factorization.
581720520968 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 72715065127 (or 72715065123 counting only the distinct ones).
The product of its (nonzero) digits is 2419200, while the sum is 53.
The spelling of 581720520968 in words is "five hundred eighty-one billion, seven hundred twenty million, five hundred twenty thousand, nine hundred sixty-eight".