18660220448266 has 4 divisors (see below), whose sum is σ = 27990330672402. Its totient is φ = 9330110224132.

The previous prime is 18660220448257. The next prime is 18660220448297. The reversal of 18660220448266 is 66284402206681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18627122287225 + 33098161041 = 4315915^2 + 181929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4665055112065 + ... + 4665055112068.

Almost surely, 2^{18660220448266} is an apocalyptic number.

18660220448266 is a deficient number, since it is larger than the sum of its proper divisors (9330110224136).

18660220448266 is an equidigital number, since it uses as much as digits as its factorization.

18660220448266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9330110224135.

The product of its (nonzero) digits is 10616832, while the sum is 55.

The spelling of 18660220448266 in words is "eighteen trillion, six hundred sixty billion, two hundred twenty million, four hundred forty-eight thousand, two hundred sixty-six".