581391026442 has 12 divisors (see below), whose sum is σ = 1259680557330. Its totient is φ = 193797008808.

The previous prime is 581391026429. The next prime is 581391026473. The reversal of 581391026442 is 244620193185.

581391026442 is a `hidden beast` number, since 58 + 139 + 1 + 0 + 26 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 323236594521 + 258154431921 = 568539^2 + 508089^2 .

It is a super-3 number, since 3×581391026442³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16149750717 + ... + 16149750752.

Almost surely, 2^581391026442 is an apocalyptic number.

581391026442 is an abundant number, since it is smaller than the sum of its proper divisors (678289530888).

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

581391026442 is a wasteful number, since it uses less digits than its factorization.

581391026442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32299501477 (or 32299501474 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 581391026442 in words is "five hundred eighty-one billion, three hundred ninety-one million, twenty-six thousand, four hundred forty-two".