12660071 has 4 divisors (see below), whose sum is σ = 12667200. Its totient is φ = 12652944.

The previous prime is 12660013. The next prime is 12660091. The reversal of 12660071 is 17006621.

12660071 is digitally balanced in base 2, 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: 17006621 = 47 ⋅361843.

It is a cyclic number.

It is not a de Polignac number, because 12660071 - 2¹⁸ = 12397927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12660091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1475 + ... + 5243.

It is an arithmetic number, because the mean of its divisors is an integer number (3166800).

Almost surely, 2^12660071 is an apocalyptic number.

12660071 is a deficient number, since it is larger than the sum of its proper divisors (7129).

12660071 is an equidigital number, since it uses as much as digits as its factorization.

12660071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7128.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 12660071 is about 3558.0993521823. The cubic root of 12660071 is about 233.0658879037.

Adding to 12660071 its reverse (17006621), we get a palindrome (29666692).

The spelling of 12660071 in words is "twelve million, six hundred sixty thousand, seventy-one".