581642861394 has 64 divisors (see below), whose sum is σ = 1346478142464. Its totient is φ = 164060533056.

The previous prime is 581642861369. The next prime is 581642861447. The reversal of 581642861394 is 493168246185.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4725517 + ... + 4847039.

It is an arithmetic number, because the mean of its divisors is an integer number (21038720976).

Almost surely, 2^581642861394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581642861394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673239071232).

581642861394 is an abundant number, since it is smaller than the sum of its proper divisors (764835281070).

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

581642861394 is a wasteful number, since it uses less digits than its factorization.

581642861394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122991.

The product of its digits is 9953280, while the sum is 57.

The spelling of 581642861394 in words is "five hundred eighty-one billion, six hundred forty-two million, eight hundred sixty-one thousand, three hundred ninety-four".