198502548138 has 24 divisors (see below), whose sum is σ = 430140449700. Its totient is φ = 66159578304.

The previous prime is 198502548119. The next prime is 198502548161. The reversal of 198502548138 is 831845205891.

198502548138 is a `hidden beast` number, since 1 + 9 + 8 + 502 + 54 + 81 + 3 + 8 = 666.

198502548138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 190063737369 + 8438810769 = 435963^2 + 91863^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 506283 + ... + 808286.

Almost surely, 2^198502548138 is an apocalyptic number.

198502548138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198502548138 is an abundant number, since it is smaller than the sum of its proper divisors (231637901562).

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

198502548138 is a wasteful number, since it uses less digits than its factorization.

198502548138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322966 (or 1322963 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 198502548138 in words is "one hundred ninety-eight billion, five hundred two million, five hundred forty-eight thousand, one hundred thirty-eight".