13881215398985 has 32 divisors (see below), whose sum is σ = 18798886529280. Its totient is φ = 9747051462400.

The previous prime is 13881215398961. The next prime is 13881215399113. The reversal of 13881215398985 is 58989351218831.

It is not a de Polignac number, because 13881215398985 - 2¹² = 13881215394889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75049679 + ... + 75234411.

It is an arithmetic number, because the mean of its divisors is an integer number (587465204040).

Almost surely, 2^{13881215398985} is an apocalyptic number.

It is an amenable number.

13881215398985 is a deficient number, since it is larger than the sum of its proper divisors (4917671130295).

13881215398985 is a wasteful number, since it uses less digits than its factorization.

13881215398985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231889.

The product of its digits is 149299200, while the sum is 71.

The spelling of 13881215398985 in words is "thirteen trillion, eight hundred eighty-one billion, two hundred fifteen million, three hundred ninety-eight thousand, nine hundred eighty-five".