13415665 has 4 divisors (see below), whose sum is σ = 16098804. Its totient is φ = 10732528.

The previous prime is 13415659. The next prime is 13415681. The reversal of 13415665 is 56651431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56651431 = 73 ⋅776047.

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 3073009 = 3216^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 13415665 - 2⁷ = 13415537 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1341562 + ... + 1341571.

It is an arithmetic number, because the mean of its divisors is an integer number (4024701).

Almost surely, 2^13415665 is an apocalyptic number.

It is an amenable number.

13415665 is a deficient number, since it is larger than the sum of its proper divisors (2683139).

13415665 is an equidigital number, since it uses as much as digits as its factorization.

13415665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683138.

The product of its digits is 10800, while the sum is 31.

The square root of 13415665 is about 3662.7400945194. The cubic root of 13415665 is about 237.6132940541.

The spelling of 13415665 in words is "thirteen million, four hundred fifteen thousand, six hundred sixty-five".