12505132817817 has 4 divisors (see below), whose sum is σ = 16673510423760. Its totient is φ = 8336755211876.

The previous prime is 12505132817753. The next prime is 12505132817909. The reversal of 12505132817817 is 71871823150521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12505132817817 - 2⁶ = 12505132817753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12505132817817.

It is not an unprimeable number, because it can be changed into a prime (12505132817017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084188802967 + ... + 2084188802972.

It is an arithmetic number, because the mean of its divisors is an integer number (4168377605940).

Almost surely, 2^{12505132817817} is an apocalyptic number.

It is an amenable number.

12505132817817 is a deficient number, since it is larger than the sum of its proper divisors (4168377605943).

12505132817817 is an equidigital number, since it uses as much as digits as its factorization.

12505132817817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168377605942.

The product of its (nonzero) digits is 940800, while the sum is 51.

The spelling of 12505132817817 in words is "twelve trillion, five hundred five billion, one hundred thirty-two million, eight hundred seventeen thousand, eight hundred seventeen".