12665698 has 4 divisors (see below), whose sum is σ = 18998550. Its totient is φ = 6332848.

The previous prime is 12665689. The next prime is 12665713. The reversal of 12665698 is 89656621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89656621 = 1279 ⋅70099.

It can be written as a sum of positive squares in only one way, i.e., 10284849 + 2380849 = 3207^2 + 1543^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166423 + ... + 3166426.

Almost surely, 2^12665698 is an apocalyptic number.

12665698 is a deficient number, since it is larger than the sum of its proper divisors (6332852).

12665698 is an equidigital number, since it uses as much as digits as its factorization.

12665698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332851.

The product of its digits is 155520, while the sum is 43.

The square root of 12665698 is about 3558.8899954902. The cubic root of 12665698 is about 233.1004129206.

The spelling of 12665698 in words is "twelve million, six hundred sixty-five thousand, six hundred ninety-eight".