581138881357542 has 16 divisors (see below), whose sum is σ = 1163559215606592. Its totient is φ = 193499384970600.

The previous prime is 581138881357477. The next prime is 581138881357549. The reversal of 581138881357542 is 245753188831185.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581138881357549) 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, 53393864584 + ... + 53393875467.

It is an arithmetic number, because the mean of its divisors is an integer number (72722450975412).

Almost surely, 2^{581138881357542} is an apocalyptic number.

581138881357542 is an abundant number, since it is smaller than the sum of its proper divisors (582420334249050).

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

581138881357542 is a wasteful number, since it uses less digits than its factorization.

581138881357542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106787740963.

The product of its digits is 258048000, while the sum is 69.

The spelling of 581138881357542 in words is "five hundred eighty-one trillion, one hundred thirty-eight billion, eight hundred eighty-one million, three hundred fifty-seven thousand, five hundred forty-two".