12661648 has 20 divisors (see below), whose sum is σ = 24936028. Its totient is φ = 6226560.

The previous prime is 12661637. The next prime is 12661667. The reversal of 12661648 is 84616621.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 12475024 = 432^2 + 3532^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5511 + ... + 7462.

Almost surely, 2^12661648 is an apocalyptic number.

It is an amenable number.

12661648 is a deficient number, since it is larger than the sum of its proper divisors (12274380).

12661648 is a wasteful number, since it uses less digits than its factorization.

12661648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13042 (or 13036 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 12661648 is about 3558.3209523594. The cubic root of 12661648 is about 233.0755647753.

The spelling of 12661648 in words is "twelve million, six hundred sixty-one thousand, six hundred forty-eight".