12663505 has 4 divisors (see below), whose sum is σ = 15196212. Its totient is φ = 10130800.

The previous prime is 12663493. The next prime is 12663569. The reversal of 12663505 is 50536621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50536621 = 2113 ⋅23917.

It can be written as a sum of positive squares in 2 ways, for example, as 8485569 + 4177936 = 2913^2 + 2044^2 .

It is not a de Polignac number, because 12663505 - 2⁵ = 12663473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266346 + ... + 1266355.

It is an arithmetic number, because the mean of its divisors is an integer number (3799053).

Almost surely, 2^12663505 is an apocalyptic number.

It is an amenable number.

12663505 is a deficient number, since it is larger than the sum of its proper divisors (2532707).

12663505 is an equidigital number, since it uses as much as digits as its factorization.

12663505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532706.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 12663505 is about 3558.5818804687. The cubic root of 12663505 is about 233.0869587677.

The spelling of 12663505 in words is "twelve million, six hundred sixty-three thousand, five hundred five".