198745579172 has 36 divisors (see below), whose sum is σ = 405656884080. Its totient is φ = 84951904464.

The previous prime is 198745579129. The next prime is 198745579247. The reversal of 198745579172 is 271975547891.

It is a junction number, because it is equal to n+sod(n) for n = 198745579099 and 198745579108.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1263458 + ... + 1412025.

It is an arithmetic number, because the mean of its divisors is an integer number (11268246780).

Almost surely, 2^198745579172 is an apocalyptic number.

It is an amenable number.

198745579172 is an abundant number, since it is smaller than the sum of its proper divisors (206911304908).

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

198745579172 is a wasteful number, since it uses less digits than its factorization.

198745579172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675880 (or 2675871 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 65.

The spelling of 198745579172 in words is "one hundred ninety-eight billion, seven hundred forty-five million, five hundred seventy-nine thousand, one hundred seventy-two".