13161665 has 16 divisors (see below), whose sum is σ = 17516736. Its totient is φ = 9412800.

The previous prime is 13161601. The next prime is 13161703. The reversal of 13161665 is 56616131.

It is not a de Polignac number, because 13161665 - 2⁶ = 13161601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1394 + ... + 5316.

It is an arithmetic number, because the mean of its divisors is an integer number (1094796).

Almost surely, 2^13161665 is an apocalyptic number.

It is an amenable number.

13161665 is a deficient number, since it is larger than the sum of its proper divisors (4355071).

13161665 is a wasteful number, since it uses less digits than its factorization.

13161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000.

The product of its digits is 3240, while the sum is 29.

The square root of 13161665 is about 3627.9009082388. The cubic root of 13161665 is about 236.1041446413.

Adding to 13161665 its reverse (56616131), we get a palindrome (69777796).

The spelling of 13161665 in words is "thirteen million, one hundred sixty-one thousand, six hundred sixty-five".