581139487857 has 8 divisors (see below), whose sum is σ = 776228945184. Its totient is φ = 386738177888.

The previous prime is 581139487849. The next prime is 581139487861. The reversal of 581139487857 is 758784931185.

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 581139487857 - 2³ = 581139487849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (581139487867) 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, 172034868 + ... + 172038245.

It is an arithmetic number, because the mean of its divisors is an integer number (97028618148).

Almost surely, 2^581139487857 is an apocalyptic number.

It is an amenable number.

581139487857 is a deficient number, since it is larger than the sum of its proper divisors (195089457327).

581139487857 is a wasteful number, since it uses less digits than its factorization.

581139487857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344073679.

The product of its digits is 67737600, while the sum is 66.

The spelling of 581139487857 in words is "five hundred eighty-one billion, one hundred thirty-nine million, four hundred eighty-seven thousand, eight hundred fifty-seven".