13066681 has 4 divisors (see below), whose sum is σ = 13074292. Its totient is φ = 13059072.

The previous prime is 13066657. The next prime is 13066709. The reversal of 13066681 is 18666031.

13066681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18666031 = 419 ⋅44549.

It can be written as a sum of positive squares in 2 ways, for example, as 9517225 + 3549456 = 3085^2 + 1884^2 .

It is a cyclic number.

It is not a de Polignac number, because 13066681 - 2⁹ = 13066169 is a prime.

It is a super-2 number, since 2×13066681² = 341476304711522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13066621) 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 3 ways as a sum of consecutive naturals, for example, 121 + ... + 5113.

It is an arithmetic number, because the mean of its divisors is an integer number (3268573).

Almost surely, 2^13066681 is an apocalyptic number.

It is an amenable number.

13066681 is a deficient number, since it is larger than the sum of its proper divisors (7611).

13066681 is an equidigital number, since it uses as much as digits as its factorization.

13066681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 13066681 is about 3614.7864390583. The cubic root of 13066681 is about 235.5348073260.

The spelling of 13066681 in words is "thirteen million, sixty-six thousand, six hundred eighty-one".