18666049898 has 8 divisors (see below), whose sum is σ = 28458076260. Its totient is φ = 9180024480.

The previous prime is 18666049891. The next prime is 18666049991. The reversal of 18666049898 is 89894066681.

It can be written as a sum of positive squares in 2 ways, for example, as 13890272449 + 4775777449 = 117857^2 + 69107^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18666049891) 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, 76500083 + ... + 76500326.

Almost surely, 2^18666049898 is an apocalyptic number.

18666049898 is a deficient number, since it is larger than the sum of its proper divisors (9792026362).

18666049898 is a wasteful number, since it uses less digits than its factorization.

18666049898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153000472.

The product of its (nonzero) digits is 35831808, while the sum is 65.

The spelling of 18666049898 in words is "eighteen billion, six hundred sixty-six million, forty-nine thousand, eight hundred ninety-eight".