198138502144 has 44 divisors (see below), whose sum is σ = 432091126008. Its totient is φ = 90062950400.

The previous prime is 198138502141. The next prime is 198138502171. The reversal of 198138502144 is 441205831891.

It is a tau number, because it is divible by the number of its divisors (44).

It is a super-3 number, since 3×198138502144³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 198138502094 and 198138502103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198138502141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8783947 + ... + 8806474.

Almost surely, 2^198138502144 is an apocalyptic number.

It is an amenable number.

198138502144 is an abundant number, since it is smaller than the sum of its proper divisors (233952623864).

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

198138502144 is a wasteful number, since it uses less digits than its factorization.

198138502144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17590452 (or 17590434 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 198138502144 in words is "one hundred ninety-eight billion, one hundred thirty-eight million, five hundred two thousand, one hundred forty-four".