198778858799068 has 72 divisors (see below), whose sum is σ = 379651344997680. Its totient is φ = 90982462003200.

The previous prime is 198778858799021. The next prime is 198778858799077. The reversal of 198778858799068 is 860997858877891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119749968 + ... + 121398568.

It is an arithmetic number, because the mean of its divisors is an integer number (5272935347190).

Almost surely, 2^{198778858799068} is an apocalyptic number.

It is an amenable number.

198778858799068 is a deficient number, since it is larger than the sum of its proper divisors (180872486198612).

198778858799068 is a wasteful number, since it uses less digits than its factorization.

198778858799068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651495 (or 1651476 counting only the distinct ones).

The product of its (nonzero) digits is 245806202880, while the sum is 100.

The spelling of 198778858799068 in words is "one hundred ninety-eight trillion, seven hundred seventy-eight billion, eight hundred fifty-eight million, seven hundred ninety-nine thousand, sixty-eight".