12664515 has 16 divisors (see below), whose sum is σ = 20596896. Its totient is φ = 6643200.

The previous prime is 12664511. The next prime is 12664517. The reversal of 12664515 is 51546621.

12664515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12664515 - 2² = 12664511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12664511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6006 + ... + 7835.

It is an arithmetic number, because the mean of its divisors is an integer number (1287306).

Almost surely, 2^12664515 is an apocalyptic number.

12664515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12664515 is a deficient number, since it is larger than the sum of its proper divisors (7932381).

12664515 is a wasteful number, since it uses less digits than its factorization.

12664515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13910.

The product of its digits is 7200, while the sum is 30.

The square root of 12664515 is about 3558.7237881016. The cubic root of 12664515 is about 233.0931553558.

The spelling of 12664515 in words is "twelve million, six hundred sixty-four thousand, five hundred fifteen".