1281871345018 has 24 divisors (see below), whose sum is σ = 2113607825280. Its totient is φ = 582638687400.

The previous prime is 1281871344979. The next prime is 1281871345147. The reversal of 1281871345018 is 8105431781821.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4945713 + ... + 5198443.

It is an arithmetic number, because the mean of its divisors is an integer number (88066992720).

Almost surely, 2^{1281871345018} is an apocalyptic number.

1281871345018 is a deficient number, since it is larger than the sum of its proper divisors (831736480262).

1281871345018 is a wasteful number, since it uses less digits than its factorization.

1281871345018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273714 (or 273703 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 49.

The spelling of 1281871345018 in words is "one trillion, two hundred eighty-one billion, eight hundred seventy-one million, three hundred forty-five thousand, eighteen".