18198200434 has 4 divisors (see below), whose sum is σ = 27297300654. Its totient is φ = 9099100216.

The previous prime is 18198200417. The next prime is 18198200467. The reversal of 18198200434 is 43400289181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17344099809 + 854100625 = 131697^2 + 29225^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4549550107 + ... + 4549550110.

Almost surely, 2^18198200434 is an apocalyptic number.

18198200434 is a deficient number, since it is larger than the sum of its proper divisors (9099100220).

18198200434 is an equidigital number, since it uses as much as digits as its factorization.

18198200434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9099100219.

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 18198200434 in words is "eighteen billion, one hundred ninety-eight million, two hundred thousand, four hundred thirty-four".