198324423891 has 64 divisors (see below), whose sum is σ = 332896174080. Its totient is φ = 115604820000.

The previous prime is 198324423889. The next prime is 198324423893.

198324423891 is a `hidden beast` number, since 1 + 9 + 83 + 2 + 442 + 38 + 91 = 666.

198324423891 is nontrivially palindromic in base 10.

198324423891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (198324423889) and next prime (198324423893).

It is not a de Polignac number, because 198324423891 - 2¹ = 198324423889 is a prime.

It is a super-2 number, since 2×198324423891² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198324423893) 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 63 ways as a sum of consecutive naturals, for example, 1434666 + ... + 1566816.

It is an arithmetic number, because the mean of its divisors is an integer number (5201502720).

Almost surely, 2^198324423891 is an apocalyptic number.

198324423891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198324423891 is a deficient number, since it is larger than the sum of its proper divisors (134571750189).

198324423891 is a wasteful number, since it uses less digits than its factorization.

198324423891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132365 (or 132359 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The spelling of 198324423891 in words is "one hundred ninety-eight billion, three hundred twenty-four million, four hundred twenty-three thousand, eight hundred ninety-one".