12664305 has 12 divisors (see below), whose sum is σ = 21951540. Its totient is φ = 6754272.

The previous prime is 12664277. The next prime is 12664307. The reversal of 12664305 is 50346621.

12664305 is a `hidden beast` number, since 12 + 6 + 643 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9678321 + 2985984 = 3111^2 + 1728^2 .

It is not a de Polignac number, because 12664305 - 2⁸ = 12664049 is a prime.

It is a super-2 number, since 2×12664305² = 320769242266050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12664307) 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 11 ways as a sum of consecutive naturals, for example, 140670 + ... + 140759.

It is an arithmetic number, because the mean of its divisors is an integer number (1829295).

Almost surely, 2^12664305 is an apocalyptic number.

12664305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12664305 is a deficient number, since it is larger than the sum of its proper divisors (9287235).

12664305 is a wasteful number, since it uses less digits than its factorization.

12664305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281440 (or 281437 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 12664305 is about 3558.6942830201. The cubic root of 12664305 is about 233.0918669834.

The spelling of 12664305 in words is "twelve million, six hundred sixty-four thousand, three hundred five".