581581486681 has 8 divisors (see below), whose sum is σ = 627442981704. Its totient is φ = 535880628480.

The previous prime is 581581486643. The next prime is 581581486691. The reversal of 581581486681 is 186684185185.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6661171456 + 574920315225 = 81616^2 + 758235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 581581486681 - 2³¹ = 579434003033 is a prime.

It is a super-2 number, since 2×581581486681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581581486691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40151680 + ... + 40166161.

It is an arithmetic number, because the mean of its divisors is an integer number (78430372713).

Almost surely, 2^581581486681 is an apocalyptic number.

It is an amenable number.

581581486681 is a deficient number, since it is larger than the sum of its proper divisors (45861495023).

581581486681 is a wasteful number, since it uses less digits than its factorization.

581581486681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80318411.

The product of its digits is 14745600, while the sum is 61.

The spelling of 581581486681 in words is "five hundred eighty-one billion, five hundred eighty-one million, four hundred eighty-six thousand, six hundred eighty-one".