13261665 has 8 divisors (see below), whose sum is σ = 21218688. Its totient is φ = 7072880.

The previous prime is 13261631. The next prime is 13261667. The reversal of 13261665 is 56616231.

13261665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13261665 - 2⁹ = 13261153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13261667) 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, 442041 + ... + 442070.

It is an arithmetic number, because the mean of its divisors is an integer number (2652336).

Almost surely, 2^13261665 is an apocalyptic number.

13261665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13261665 is a deficient number, since it is larger than the sum of its proper divisors (7957023).

13261665 is an equidigital number, since it uses as much as digits as its factorization.

13261665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884119.

The product of its digits is 6480, while the sum is 30.

The square root of 13261665 is about 3641.6569031143. The cubic root of 13261665 is about 236.7005957660.

Adding to 13261665 its reverse (56616231), we get a palindrome (69877896).

The spelling of 13261665 in words is "thirteen million, two hundred sixty-one thousand, six hundred sixty-five".