18245666 has 4 divisors (see below), whose sum is σ = 27368502. Its totient is φ = 9122832.

The previous prime is 18245663. The next prime is 18245677. The reversal of 18245666 is 66654281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66654281 = 983 ⋅67807.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 4225 = 4271^2 + 65^2 .

It is not an unprimeable number, because it can be changed into a prime (18245663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4561415 + ... + 4561418.

Almost surely, 2^18245666 is an apocalyptic number.

18245666 is a deficient number, since it is larger than the sum of its proper divisors (9122836).

18245666 is an equidigital number, since it uses as much as digits as its factorization.

18245666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9122835.

The product of its digits is 69120, while the sum is 38.

The square root of 18245666 is about 4271.4945862075. The cubic root of 18245666 is about 263.2610284137.

The spelling of 18245666 in words is "eighteen million, two hundred forty-five thousand, six hundred sixty-six".