12643165 has 8 divisors (see below), whose sum is σ = 15420888. Its totient is φ = 9948480.

The previous prime is 12643117. The next prime is 12643177. The reversal of 12643165 is 56134621.

It can be written as a sum of positive squares in 4 ways, for example, as 657721 + 11985444 = 811^2 + 3462^2 .

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

It is not a de Polignac number, because 12643165 - 2²³ = 4254557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20422 + ... + 21031.

It is an arithmetic number, because the mean of its divisors is an integer number (1927611).

Almost surely, 2^12643165 is an apocalyptic number.

It is an amenable number.

12643165 is a deficient number, since it is larger than the sum of its proper divisors (2777723).

12643165 is an equidigital number, since it uses as much as digits as its factorization.

12643165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41519.

The product of its digits is 4320, while the sum is 28.

The square root of 12643165 is about 3555.7228519670. The cubic root of 12643165 is about 232.9620978829.

Adding to 12643165 its reverse (56134621), we get a palindrome (68777786).

The spelling of 12643165 in words is "twelve million, six hundred forty-three thousand, one hundred sixty-five".