12653665 has 4 divisors (see below), whose sum is σ = 15184404. Its totient is φ = 10122928.

The previous prime is 12653633. The next prime is 12653699. The reversal of 12653665 is 56635621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2471184 + 10182481 = 1572^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 12653665 - 2⁵ = 12653633 is a prime.

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 12653665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1265362 + ... + 1265371.

It is an arithmetic number, because the mean of its divisors is an integer number (3796101).

Almost surely, 2^12653665 is an apocalyptic number.

It is an amenable number.

12653665 is a deficient number, since it is larger than the sum of its proper divisors (2530739).

12653665 is an equidigital number, since it uses as much as digits as its factorization.

12653665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530738.

The product of its digits is 32400, while the sum is 34.

The square root of 12653665 is about 3557.1990385695. The cubic root of 12653665 is about 233.0265708000.

The spelling of 12653665 in words is "twelve million, six hundred fifty-three thousand, six hundred sixty-five".