13166665 has 4 divisors (see below), whose sum is σ = 15800004. Its totient is φ = 10533328.

The previous prime is 13166633. The next prime is 13166669. The reversal of 13166665 is 56666131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56666131 = 43 ⋅1317817.

It can be written as a sum of positive squares in 2 ways, for example, as 3606201 + 9560464 = 1899^2 + 3092^2 .

It is a cyclic number.

It is not a de Polignac number, because 13166665 - 2⁵ = 13166633 is a prime.

It is a super-2 number, since 2×13166665² = 346722134444450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13166665.

It is not an unprimeable number, because it can be changed into a prime (13166669) 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, 1316662 + ... + 1316671.

It is an arithmetic number, because the mean of its divisors is an integer number (3950001).

Almost surely, 2^13166665 is an apocalyptic number.

It is an amenable number.

13166665 is a deficient number, since it is larger than the sum of its proper divisors (2633339).

13166665 is an equidigital number, since it uses as much as digits as its factorization.

13166665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633338.

The product of its digits is 19440, while the sum is 34.

The square root of 13166665 is about 3628.5899465219. The cubic root of 13166665 is about 236.1340388141.

It can be divided in two parts, 13166 and 665, that added together give a palindrome (13831).

The spelling of 13166665 in words is "thirteen million, one hundred sixty-six thousand, six hundred sixty-five".