12665722 has 4 divisors (see below), whose sum is σ = 18998586. Its totient is φ = 6332860.

The previous prime is 12665713. The next prime is 12665743. The reversal of 12665722 is 22756621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22756621 = 149 ⋅152729.

It can be written as a sum of positive squares in only one way, i.e., 7241481 + 5424241 = 2691^2 + 2329^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166429 + ... + 3166432.

Almost surely, 2^12665722 is an apocalyptic number.

12665722 is a deficient number, since it is larger than the sum of its proper divisors (6332864).

12665722 is an equidigital number, since it uses as much as digits as its factorization.

12665722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332863.

The product of its digits is 10080, while the sum is 31.

The square root of 12665722 is about 3558.8933673264. The cubic root of 12665722 is about 233.1005601531.

The spelling of 12665722 in words is "twelve million, six hundred sixty-five thousand, seven hundred twenty-two".