12171415373985 has 16 divisors (see below), whose sum is σ = 22256302398336. Its totient is φ = 5564075599488.

The previous prime is 12171415373921. The next prime is 12171415373989. The reversal of 12171415373985 is 58937351417121.

It is not a de Polignac number, because 12171415373985 - 2⁶ = 12171415373921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12171415373989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57959120724 + ... + 57959120933.

It is an arithmetic number, because the mean of its divisors is an integer number (1391018899896).

Almost surely, 2^{12171415373985} is an apocalyptic number.

12171415373985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12171415373985 is a deficient number, since it is larger than the sum of its proper divisors (10084887024351).

12171415373985 is a wasteful number, since it uses less digits than its factorization.

12171415373985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115918241672.

The product of its digits is 6350400, while the sum is 57.

The spelling of 12171415373985 in words is "twelve trillion, one hundred seventy-one billion, four hundred fifteen million, three hundred seventy-three thousand, nine hundred eighty-five".