12012731784505 has 4 divisors (see below), whose sum is σ = 14415278141412. Its totient is φ = 9610185427600.

The previous prime is 12012731784503. The next prime is 12012731784527. The reversal of 12012731784505 is 50548713721021.

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 5789283524649 + 6223448259856 = 2406093^2 + 2494684^2 .

It is not a de Polignac number, because 12012731784505 - 2¹ = 12012731784503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12012731784503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201273178446 + ... + 1201273178455.

It is an arithmetic number, because the mean of its divisors is an integer number (3603819535353).

Almost surely, 2^{12012731784505} is an apocalyptic number.

It is an amenable number.

12012731784505 is a deficient number, since it is larger than the sum of its proper divisors (2402546356907).

12012731784505 is an equidigital number, since it uses as much as digits as its factorization.

12012731784505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402546356906.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 12012731784505 in words is "twelve trillion, twelve billion, seven hundred thirty-one million, seven hundred eighty-four thousand, five hundred five".