12916665 has 24 divisors (see below), whose sum is σ = 23220288. Its totient is φ = 6888240.

The previous prime is 12916627. The next prime is 12916669. The reversal of 12916665 is 56661921.

It is not a de Polignac number, because 12916665 - 2¹¹ = 12914617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12916669) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4101 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (967512).

Almost surely, 2^12916665 is an apocalyptic number.

12916665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12916665 is a deficient number, since it is larger than the sum of its proper divisors (10303623).

12916665 is an equidigital number, since it uses as much as digits as its factorization.

12916665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10651 (or 10639 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 12916665 is about 3593.9762102718. The cubic root of 12916665 is about 234.6299593479.

The spelling of 12916665 in words is "twelve million, nine hundred sixteen thousand, six hundred sixty-five".