12646665 has 32 divisors (see below), whose sum is σ = 23466240. Its totient is φ = 6450048.

The previous prime is 12646661. The next prime is 12646679. The reversal of 12646665 is 56664621.

It is a happy number.

It is not a de Polignac number, because 12646665 - 2² = 12646661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12646661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1069 + ... + 5141.

It is an arithmetic number, because the mean of its divisors is an integer number (733320).

Almost surely, 2^12646665 is an apocalyptic number.

12646665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12646665 is a deficient number, since it is larger than the sum of its proper divisors (10819575).

12646665 is a wasteful number, since it uses less digits than its factorization.

12646665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110 (or 4104 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 12646665 is about 3556.2149822529. The cubic root of 12646665 is about 232.9835928201.

The spelling of 12646665 in words is "twelve million, six hundred forty-six thousand, six hundred sixty-five".