12665645 has 8 divisors (see below), whose sum is σ = 15219456. Its totient is φ = 10118736.

The previous prime is 12665641. The next prime is 12665651. The reversal of 12665645 is 54656621.

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

It is a cyclic number.

It is not a de Polignac number, because 12665645 - 2² = 12665641 is a prime.

It is a super-3 number, since 3×12665645³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665641) 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, 4124 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (1902432).

Almost surely, 2^12665645 is an apocalyptic number.

It is an amenable number.

12665645 is a deficient number, since it is larger than the sum of its proper divisors (2553811).

12665645 is a wasteful number, since it uses less digits than its factorization.

12665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451.

The product of its digits is 43200, while the sum is 35.

The square root of 12665645 is about 3558.8825493405. The cubic root of 12665645 is about 233.1000877816.

The spelling of 12665645 in words is "twelve million, six hundred sixty-five thousand, six hundred forty-five".