13665305 has 4 divisors (see below), whose sum is σ = 16398372. Its totient is φ = 10932240.

The previous prime is 13665283. The next prime is 13665307. The reversal of 13665305 is 50356631.

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 8952064 + 4713241 = 2992^2 + 2171^2 .

It is not a de Polignac number, because 13665305 - 2¹⁶ = 13599769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13665307) 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, 1366526 + ... + 1366535.

It is an arithmetic number, because the mean of its divisors is an integer number (4099593).

Almost surely, 2^13665305 is an apocalyptic number.

It is an amenable number.

13665305 is a deficient number, since it is larger than the sum of its proper divisors (2733067).

13665305 is an equidigital number, since it uses as much as digits as its factorization.

13665305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733066.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 13665305 is about 3696.6613315261. The cubic root of 13665305 is about 239.0780893617.

The spelling of 13665305 in words is "thirteen million, six hundred sixty-five thousand, three hundred five".