18846643398 has 16 divisors (see below), whose sum is σ = 41119949376. Its totient is φ = 5711104040.

The previous prime is 18846643397. The next prime is 18846643423. The reversal of 18846643398 is 89334664881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18846643393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142777536 + ... + 142777667.

It is an arithmetic number, because the mean of its divisors is an integer number (2569996836).

Almost surely, 2^18846643398 is an apocalyptic number.

18846643398 is an abundant number, since it is smaller than the sum of its proper divisors (22273305978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18846643398 is a wasteful number, since it uses less digits than its factorization.

18846643398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285555219.

The product of its digits is 23887872, while the sum is 60.

The spelling of 18846643398 in words is "eighteen billion, eight hundred forty-six million, six hundred forty-three thousand, three hundred ninety-eight".