13206665 has 8 divisors (see below), whose sum is σ = 15936648. Its totient is φ = 10506240.

The previous prime is 13206631. The next prime is 13206679. The reversal of 13206665 is 56660231.

It can be written as a sum of positive squares in 4 ways, for example, as 900601 + 12306064 = 949^2 + 3508^2 .

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

It is not a de Polignac number, because 13206665 - 2⁶ = 13206601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6392 + ... + 8201.

It is an arithmetic number, because the mean of its divisors is an integer number (1992081).

Almost surely, 2^13206665 is an apocalyptic number.

It is an amenable number.

13206665 is a deficient number, since it is larger than the sum of its proper divisors (2729983).

13206665 is a wasteful number, since it uses less digits than its factorization.

13206665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14779.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 13206665 is about 3634.0975495988. The cubic root of 13206665 is about 236.3729201795.

Adding to 13206665 its reverse (56660231), we get a palindrome (69866896).

The spelling of 13206665 in words is "thirteen million, two hundred six thousand, six hundred sixty-five".