581731120368 has 60 divisors (see below), whose sum is σ = 1628094675480. Its totient is φ = 193903763328.

The previous prime is 581731120367. The next prime is 581731120417. The reversal of 581731120368 is 863021137185.

It is a happy number.

581731120368 is a `hidden beast` number, since 5 + 8 + 173 + 112 + 0 + 368 = 666.

It is a Cunningham number, because it is equal to 762713²-1.

It is a super-2 number, since 2×581731120368² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581731120367) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 6054043 + ... + 6149381.

It is an arithmetic number, because the mean of its divisors is an integer number (27134911258).

Almost surely, 2^581731120368 is an apocalyptic number.

It is an amenable number.

581731120368 is an abundant number, since it is smaller than the sum of its proper divisors (1046363555112).

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

581731120368 is a wasteful number, since it uses less digits than its factorization.

581731120368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137726 (or 137717 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 581731120368 in words is "five hundred eighty-one billion, seven hundred thirty-one million, one hundred twenty thousand, three hundred sixty-eight".