11663866 has 4 divisors (see below), whose sum is σ = 17495802. Its totient is φ = 5831932.

The previous prime is 11663863. The next prime is 11663893. The reversal of 11663866 is 66836611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66836611 = 1733 ⋅38567.

It can be written as a sum of positive squares in only one way, i.e., 10751841 + 912025 = 3279^2 + 955^2 .

It is not an unprimeable number, because it can be changed into a prime (11663863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2915965 + ... + 2915968.

Almost surely, 2^11663866 is an apocalyptic number.

11663866 is a deficient number, since it is larger than the sum of its proper divisors (5831936).

11663866 is an equidigital number, since it uses as much as digits as its factorization.

11663866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831935.

The product of its digits is 31104, while the sum is 37.

The square root of 11663866 is about 3415.2402550919. The cubic root of 11663866 is about 226.7849205137.

The spelling of 11663866 in words is "eleven million, six hundred sixty-three thousand, eight hundred sixty-six".