12517981781775 has 96 divisors (see below), whose sum is σ = 20964136542720. Its totient is φ = 6590275706880.

The previous prime is 12517981781761. The next prime is 12517981781819. The reversal of 12517981781775 is 57718718971521.

It is a Cunningham number, because it is equal to 3538076²-1.

It is not a de Polignac number, because 12517981781775 - 2¹¹ = 12517981779727 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8579835996 + ... + 8579837454.

It is an arithmetic number, because the mean of its divisors is an integer number (218376422320).

Almost surely, 2^{12517981781775} is an apocalyptic number.

12517981781775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12517981781775 is a deficient number, since it is larger than the sum of its proper divisors (8446154760945).

12517981781775 is a wasteful number, since it uses less digits than its factorization.

12517981781775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825 (or 3820 counting only the distinct ones).

The product of its digits is 69148800, while the sum is 69.

The spelling of 12517981781775 in words is "twelve trillion, five hundred seventeen billion, nine hundred eighty-one million, seven hundred eighty-one thousand, seven hundred seventy-five".