12664825 has 6 divisors (see below), whose sum is σ = 15704414. Its totient is φ = 10131840.

The previous prime is 12664807. The next prime is 12664829. The reversal of 12664825 is 52846621.

It can be written as a sum of positive squares in 3 ways, for example, as 3356224 + 9308601 = 1832^2 + 3051^2 .

It is not a de Polignac number, because 12664825 - 2¹⁵ = 12632057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12664829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253272 + ... + 253321.

Almost surely, 2^12664825 is an apocalyptic number.

It is an amenable number.

12664825 is a deficient number, since it is larger than the sum of its proper divisors (3039589).

12664825 is an equidigital number, since it uses as much as digits as its factorization.

12664825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506603 (or 506598 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 12664825 is about 3558.7673427747. The cubic root of 12664825 is about 233.0950572127.

The spelling of 12664825 in words is "twelve million, six hundred sixty-four thousand, eight hundred twenty-five".