12662649 has 10 divisors (see below), whose sum is σ = 18915930. Its totient is φ = 8441712.

The previous prime is 12662641. The next prime is 12662651. The reversal of 12662649 is 94626621.

12662649 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 2 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10791225 + 1871424 = 3285^2 + 1368^2 .

It is not a de Polignac number, because 12662649 - 2³ = 12662641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12662641) 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 9 ways as a sum of consecutive naturals, for example, 78084 + ... + 78245.

It is an arithmetic number, because the mean of its divisors is an integer number (1891593).

Almost surely, 2^12662649 is an apocalyptic number.

It is an amenable number.

12662649 is a deficient number, since it is larger than the sum of its proper divisors (6253281).

12662649 is an equidigital number, since it uses as much as digits as its factorization.

12662649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156341 (or 156332 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 12662649 is about 3558.4616058066. The cubic root of 12662649 is about 233.0817067481.

The spelling of 12662649 in words is "twelve million, six hundred sixty-two thousand, six hundred forty-nine".