18056866 has 4 divisors (see below), whose sum is σ = 27085302. Its totient is φ = 9028432.

The previous prime is 18056833. The next prime is 18056867. The reversal of 18056866 is 66865081.

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: 66865081 = 709 ⋅94309.

It can be written as a sum of positive squares in only one way, i.e., 15046641 + 3010225 = 3879^2 + 1735^2 .

It is not an unprimeable number, because it can be changed into a prime (18056867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4514215 + ... + 4514218.

Almost surely, 2^18056866 is an apocalyptic number.

18056866 is a deficient number, since it is larger than the sum of its proper divisors (9028436).

18056866 is an equidigital number, since it uses as much as digits as its factorization.

18056866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9028435.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 18056866 is about 4249.3371247761. The cubic root of 18056866 is about 262.3498327806.

The spelling of 18056866 in words is "eighteen million, fifty-six thousand, eight hundred sixty-six".