13665565 has 8 divisors (see below), whose sum is σ = 17111808. Its totient is φ = 10457040.

The previous prime is 13665563. The next prime is 13665571. The reversal of 13665565 is 56556631.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13665565 - 2¹ = 13665563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59301 + ... + 59530.

It is an arithmetic number, because the mean of its divisors is an integer number (2138976).

Almost surely, 2^13665565 is an apocalyptic number.

It is an amenable number.

13665565 is a deficient number, since it is larger than the sum of its proper divisors (3446243).

13665565 is a wasteful number, since it uses less digits than its factorization.

13665565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118859.

The product of its digits is 81000, while the sum is 37.

The square root of 13665565 is about 3696.6964982265. The cubic root of 13665565 is about 239.0796056081.

It can be divided in two parts, 1366556 and 5, that added together give a square (1366561 = 1169²).

The spelling of 13665565 in words is "thirteen million, six hundred sixty-five thousand, five hundred sixty-five".