12512666 has 4 divisors (see below), whose sum is σ = 18769002. Its totient is φ = 6256332.

The previous prime is 12512653. The next prime is 12512681. The reversal of 12512666 is 66621521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66621521 = 17 ⋅3918913.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 1256641 = 3355^2 + 1121^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128165 + ... + 3128168.

Almost surely, 2^12512666 is an apocalyptic number.

12512666 is a deficient number, since it is larger than the sum of its proper divisors (6256336).

12512666 is an equidigital number, since it uses as much as digits as its factorization.

12512666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256335.

The product of its digits is 4320, while the sum is 29.

The square root of 12512666 is about 3537.3246953029. The cubic root of 12512666 is about 232.1578023717.

The spelling of 12512666 in words is "twelve million, five hundred twelve thousand, six hundred sixty-six".