12666506 has 8 divisors (see below), whose sum is σ = 19513380. Its totient is φ = 6162048.

The previous prime is 12666503. The next prime is 12666517. The reversal of 12666506 is 60566621.

It can be written as a sum of positive squares in 2 ways, for example, as 12666481 + 25 = 3559^2 + 5^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12666503) 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, 85511 + ... + 85658.

Almost surely, 2^12666506 is an apocalyptic number.

12666506 is a deficient number, since it is larger than the sum of its proper divisors (6846874).

12666506 is a wasteful number, since it uses less digits than its factorization.

12666506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171208.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 12666506 is about 3559.0035122208. The cubic root of 12666506 is about 233.1053696452.

The spelling of 12666506 in words is "twelve million, six hundred sixty-six thousand, five hundred six".