1581131885499 has 24 divisors (see below), whose sum is σ = 2324143737552. Its totient is φ = 1035634455360.

The previous prime is 1581131885491. The next prime is 1581131885519. The reversal of 1581131885499 is 9945881311851.

1581131885499 is a `hidden beast` number, since 1 + 5 + 8 + 1 + 1 + 3 + 1 + 88 + 549 + 9 = 666.

It is not a de Polignac number, because 1581131885499 - 2³ = 1581131885491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1581131885491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5711872 + ... + 5982285.

It is an arithmetic number, because the mean of its divisors is an integer number (96839322398).

Almost surely, 2^{1581131885499} is an apocalyptic number.

1581131885499 is a deficient number, since it is larger than the sum of its proper divisors (743011852053).

1581131885499 is a wasteful number, since it uses less digits than its factorization.

1581131885499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11694427 (or 11694424 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 63.

The spelling of 1581131885499 in words is "one trillion, five hundred eighty-one billion, one hundred thirty-one million, eight hundred eighty-five thousand, four hundred ninety-nine".