581581005861 has 8 divisors (see below), whose sum is σ = 775620568384. Its totient is φ = 387631056960.

The previous prime is 581581005839. The next prime is 581581005877. The reversal of 581581005861 is 168500185185.

581581005861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 581581005861 - 2¹⁸ = 581580743717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 581581005861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581581005961) 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, 22388260 + ... + 22414221.

It is an arithmetic number, because the mean of its divisors is an integer number (96952571048).

Almost surely, 2^581581005861 is an apocalyptic number.

It is an amenable number.

581581005861 is a deficient number, since it is larger than the sum of its proper divisors (194039562523).

581581005861 is a wasteful number, since it uses less digits than its factorization.

581581005861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44806811.

The product of its (nonzero) digits is 384000, while the sum is 48.

The spelling of 581581005861 in words is "five hundred eighty-one billion, five hundred eighty-one million, five thousand, eight hundred sixty-one".