11815666 has 8 divisors (see below), whose sum is σ = 17814060. Its totient is φ = 5877648.

The previous prime is 11815649. The next prime is 11815711. The reversal of 11815666 is 66651811.

11815666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8874441 + 2941225 = 2979^2 + 1715^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14601 + ... + 15388.

Almost surely, 2^11815666 is an apocalyptic number.

11815666 is a deficient number, since it is larger than the sum of its proper divisors (5998394).

11815666 is a wasteful number, since it uses less digits than its factorization.

11815666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30188.

The product of its digits is 8640, while the sum is 34.

The square root of 11815666 is about 3437.3923255864. The cubic root of 11815666 is about 227.7645178259.

The spelling of 11815666 in words is "eleven million, eight hundred fifteen thousand, six hundred sixty-six".