18861066484 has 12 divisors (see below), whose sum is σ = 35545856164. Its totient is φ = 8705107584.

The previous prime is 18861066481. The next prime is 18861066491. The reversal of 18861066484 is 48466016881.

It can be written as a sum of positive squares in 2 ways, for example, as 11199565584 + 7661500900 = 105828^2 + 87530^2 .

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 362712817 = 18861066484 / (1 + 8 + 8 + 6 + 1 + 0 + 6 + 6 + 4 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861066481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181356357 + ... + 181356460.

Almost surely, 2^18861066484 is an apocalyptic number.

It is an amenable number.

18861066484 is a deficient number, since it is larger than the sum of its proper divisors (16684789680).

18861066484 is a wasteful number, since it uses less digits than its factorization.

18861066484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362712834 (or 362712832 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 52.

The spelling of 18861066484 in words is "eighteen billion, eight hundred sixty-one million, sixty-six thousand, four hundred eighty-four".