11858666 has 4 divisors (see below), whose sum is σ = 17788002. Its totient is φ = 5929332.

The previous prime is 11858659. The next prime is 11858683. The reversal of 11858666 is 66685811.

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: 66685811 = 277 ⋅240743.

It can be written as a sum of positive squares in only one way, i.e., 7958041 + 3900625 = 2821^2 + 1975^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2964665 + ... + 2964668.

Almost surely, 2^11858666 is an apocalyptic number.

11858666 is a deficient number, since it is larger than the sum of its proper divisors (5929336).

11858666 is an equidigital number, since it uses as much as digits as its factorization.

11858666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5929335.

The product of its digits is 69120, while the sum is 41.

The square root of 11858666 is about 3443.6413866720. The cubic root of 11858666 is about 228.0404796292.

The spelling of 11858666 in words is "eleven million, eight hundred fifty-eight thousand, six hundred sixty-six".