18665490818 has 8 divisors (see below), whose sum is σ = 30151946748. Its totient is φ = 8614841904.

The previous prime is 18665490797. The next prime is 18665490839. The reversal of 18665490818 is 81809456681.

It is an interprime number because it is at equal distance from previous prime (18665490797) and next prime (18665490839).

It can be written as a sum of positive squares in 2 ways, for example, as 15646757569 + 3018733249 = 125087^2 + 54943^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 358951721 + ... + 358951772.

Almost surely, 2^18665490818 is an apocalyptic number.

18665490818 is a deficient number, since it is larger than the sum of its proper divisors (11486455930).

18665490818 is a wasteful number, since it uses less digits than its factorization.

18665490818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717903508.

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 18665490818 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety thousand, eight hundred eighteen".