1581318116508 has 72 divisors (see below), whose sum is σ = 4051675022976. Its totient is φ = 479706427200.

The previous prime is 1581318116507. The next prime is 1581318116531. The reversal of 1581318116508 is 8056118131851.

It is a super-2 number, since 2×1581318116508² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581318116503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5347158 + ... + 5635133.

It is an arithmetic number, because the mean of its divisors is an integer number (56273264208).

Almost surely, 2^{1581318116508} is an apocalyptic number.

It is an amenable number.

1581318116508 is an abundant number, since it is smaller than the sum of its proper divisors (2470356906468).

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

1581318116508 is a wasteful number, since it uses less digits than its factorization.

1581318116508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10982395 (or 10982380 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 48.

The spelling of 1581318116508 in words is "one trillion, five hundred eighty-one billion, three hundred eighteen million, one hundred sixteen thousand, five hundred eight".