12117754138505 has 4 divisors (see below), whose sum is σ = 14541304966212. Its totient is φ = 9694203310800.

The previous prime is 12117754138471. The next prime is 12117754138537. The reversal of 12117754138505 is 50583145771121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5680233288976 + 6437520849529 = 2383324^2 + 2537227^2 .

It is not a de Polignac number, because 12117754138505 - 2²⁰ = 12117753089929 is a prime.

It is a super-2 number, since 2×12117754138505² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1211775413846 + ... + 1211775413855.

It is an arithmetic number, because the mean of its divisors is an integer number (3635326241553).

Almost surely, 2^{12117754138505} is an apocalyptic number.

It is an amenable number.

12117754138505 is a deficient number, since it is larger than the sum of its proper divisors (2423550827707).

12117754138505 is an equidigital number, since it uses as much as digits as its factorization.

12117754138505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423550827706.

The product of its (nonzero) digits is 1176000, while the sum is 50.

The spelling of 12117754138505 in words is "twelve trillion, one hundred seventeen billion, seven hundred fifty-four million, one hundred thirty-eight thousand, five hundred five".