18866774618 has 8 divisors (see below), whose sum is σ = 28300909140. Its totient is φ = 9433138240.

The previous prime is 18866774611. The next prime is 18866774621. The reversal of 18866774618 is 81647766881.

It can be written as a sum of positive squares in 2 ways, for example, as 15390139249 + 3476635369 = 124057^2 + 58963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18866774611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063 + ... + 194418.

Almost surely, 2^18866774618 is an apocalyptic number.

18866774618 is a deficient number, since it is larger than the sum of its proper divisors (9434134522).

18866774618 is a wasteful number, since it uses less digits than its factorization.

18866774618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249072.

The product of its digits is 21676032, while the sum is 62.

The spelling of 18866774618 in words is "eighteen billion, eight hundred sixty-six million, seven hundred seventy-four thousand, six hundred eighteen".