12998666 has 4 divisors (see below), whose sum is σ = 19498002. Its totient is φ = 6499332.

The previous prime is 12998663. The next prime is 12998669. The reversal of 12998666 is 66689921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66689921 = 1097 ⋅60793.

It is an interprime number because it is at equal distance from previous prime (12998663) and next prime (12998669).

It can be written as a sum of positive squares in only one way, i.e., 9740641 + 3258025 = 3121^2 + 1805^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12998666.

It is not an unprimeable number, because it can be changed into a prime (12998663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3249665 + ... + 3249668.

Almost surely, 2^12998666 is an apocalyptic number.

12998666 is a deficient number, since it is larger than the sum of its proper divisors (6499336).

12998666 is an equidigital number, since it uses as much as digits as its factorization.

12998666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6499335.

The product of its digits is 279936, while the sum is 47.

The square root of 12998666 is about 3605.3662782025. The cubic root of 12998666 is about 235.1254257265.

The spelling of 12998666 in words is "twelve million, nine hundred ninety-eight thousand, six hundred sixty-six".