581121720045 has 12 divisors (see below), whose sum is σ = 1007277648156. Its totient is φ = 309931584000.

The previous prime is 581121720037. The next prime is 581121720071. The reversal of 581121720045 is 540027121185.

It is a happy number.

581121720045 is a `hidden beast` number, since 581 + 1 + 2 + 1 + 72 + 0 + 0 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 428473667241 + 152648052804 = 654579^2 + 390702^2 .

It is not a de Polignac number, because 581121720045 - 2³ = 581121720037 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 581121719991 and 581121720009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6456907956 + ... + 6456908045.

It is an arithmetic number, because the mean of its divisors is an integer number (83939804013).

Almost surely, 2^581121720045 is an apocalyptic number.

It is an amenable number.

581121720045 is a deficient number, since it is larger than the sum of its proper divisors (426155928111).

581121720045 is a wasteful number, since it uses less digits than its factorization.

581121720045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12913816012 (or 12913816009 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 581121720045 in words is "five hundred eighty-one billion, one hundred twenty-one million, seven hundred twenty thousand, forty-five".