18851900194 has 8 divisors (see below), whose sum is σ = 28358876700. Its totient is φ = 9398941296.

The previous prime is 18851900189. The next prime is 18851900201. The reversal of 18851900194 is 49100915881.

It can be written as a sum of positive squares in 2 ways, for example, as 17393653225 + 1458246969 = 131885^2 + 38187^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13503529 + ... + 13504924.

Almost surely, 2^18851900194 is an apocalyptic number.

18851900194 is a deficient number, since it is larger than the sum of its proper divisors (9506976506).

18851900194 is a wasteful number, since it uses less digits than its factorization.

18851900194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27008804.

The product of its (nonzero) digits is 103680, while the sum is 46.

The spelling of 18851900194 in words is "eighteen billion, eight hundred fifty-one million, nine hundred thousand, one hundred ninety-four".