12863666 has 4 divisors (see below), whose sum is σ = 19295502. Its totient is φ = 6431832.

The previous prime is 12863657. The next prime is 12863671. The reversal of 12863666 is 66636821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66636821 = 17 ⋅3919813.

It can be written as a sum of positive squares in only one way, i.e., 9333025 + 3530641 = 3055^2 + 1879^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215915 + ... + 3215918.

Almost surely, 2^12863666 is an apocalyptic number.

12863666 is a deficient number, since it is larger than the sum of its proper divisors (6431836).

12863666 is an equidigital number, since it uses as much as digits as its factorization.

12863666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6431835.

The product of its digits is 62208, while the sum is 38.

The square root of 12863666 is about 3586.5953214713. The cubic root of 12863666 is about 234.3086122134.

The spelling of 12863666 in words is "twelve million, eight hundred sixty-three thousand, six hundred sixty-six".