18198795847 has 4 divisors (see below), whose sum is σ = 18293090320. Its totient is φ = 18104501376.

The previous prime is 18198795833. The next prime is 18198795869. The reversal of 18198795847 is 74859789181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18198795847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198795347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47146947 + ... + 47147332.

It is an arithmetic number, because the mean of its divisors is an integer number (4573272580).

Almost surely, 2^18198795847 is an apocalyptic number.

18198795847 is a deficient number, since it is larger than the sum of its proper divisors (94294473).

18198795847 is an equidigital number, since it uses as much as digits as its factorization.

18198795847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94294472.

The product of its digits is 40642560, while the sum is 67.

The spelling of 18198795847 in words is "eighteen billion, one hundred ninety-eight million, seven hundred ninety-five thousand, eight hundred forty-seven".