13662505 has 4 divisors (see below), whose sum is σ = 16395012. Its totient is φ = 10930000.

The previous prime is 13662469. The next prime is 13662521. The reversal of 13662505 is 50526631.

13662505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50526631 = 569 ⋅88799.

It can be written as a sum of positive squares in 2 ways, for example, as 6985449 + 6677056 = 2643^2 + 2584^2 .

It is not a de Polignac number, because 13662505 - 2¹⁷ = 13531433 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, 1366246 + ... + 1366255.

It is an arithmetic number, because the mean of its divisors is an integer number (4098753).

Almost surely, 2^13662505 is an apocalyptic number.

It is an amenable number.

13662505 is a deficient number, since it is larger than the sum of its proper divisors (2732507).

13662505 is an equidigital number, since it uses as much as digits as its factorization.

13662505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732506.

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

The square root of 13662505 is about 3696.2825920105. The cubic root of 13662505 is about 239.0617593353.

The spelling of 13662505 in words is "thirteen million, six hundred sixty-two thousand, five hundred five".