12206666 has 4 divisors (see below), whose sum is σ = 18310002. Its totient is φ = 6103332.

The previous prime is 12206647. The next prime is 12206681. The reversal of 12206666 is 66660221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66660221 = 167 ⋅399163.

It can be written as a sum of positive squares in only one way, i.e., 9579025 + 2627641 = 3095^2 + 1621^2 .

12206666 is a modest number, since divided by 6666 gives 1220 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3051665 + ... + 3051668.

Almost surely, 2^12206666 is an apocalyptic number.

12206666 is a deficient number, since it is larger than the sum of its proper divisors (6103336).

12206666 is an equidigital number, since it uses as much as digits as its factorization.

12206666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6103335.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 12206666 is about 3493.8039441274. The cubic root of 12206666 is about 230.2496721642.

Adding to 12206666 its reverse (66660221), we get a palindrome (78866887).

The spelling of 12206666 in words is "twelve million, two hundred six thousand, six hundred sixty-six".