13145665 has 24 divisors (see below), whose sum is σ = 17497728. Its totient is φ = 9472320.

The previous prime is 13145651. The next prime is 13145681. The reversal of 13145665 is 56654131.

It is not a de Polignac number, because 13145665 - 2¹¹ = 13143617 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.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39550 + ... + 39880.

It is an arithmetic number, because the mean of its divisors is an integer number (729072).

Almost surely, 2^13145665 is an apocalyptic number.

It is an amenable number.

13145665 is a deficient number, since it is larger than the sum of its proper divisors (4352063).

13145665 is a wasteful number, since it uses less digits than its factorization.

13145665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 396 counting only the distinct ones).

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

The square root of 13145665 is about 3625.6951057694. The cubic root of 13145665 is about 236.0084323809.

Adding to 13145665 its reverse (56654131), we get a palindrome (69799796).

It can be divided in two parts, 131 and 45665, that added together give a square (45796 = 214²).

The spelling of 13145665 in words is "thirteen million, one hundred forty-five thousand, six hundred sixty-five".