581354868440 has 64 divisors (see below), whose sum is σ = 1336820284800. Its totient is φ = 227433927168.

The previous prime is 581354868401. The next prime is 581354868527. The reversal of 581354868440 is 44868453185.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2578322 + ... + 2794718.

It is an arithmetic number, because the mean of its divisors is an integer number (20887816950).

Almost surely, 2^581354868440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581354868440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668410142400).

581354868440 is an abundant number, since it is smaller than the sum of its proper divisors (755465416360).

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

581354868440 is a wasteful number, since it uses less digits than its factorization.

581354868440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217884 (or 217880 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 56.

The spelling of 581354868440 in words is "five hundred eighty-one billion, three hundred fifty-four million, eight hundred sixty-eight thousand, four hundred forty".