198778858799067 has 32 divisors (see below), whose sum is σ = 295244250470400. Its totient is φ = 132178600233504.

The previous prime is 198778858799021. The next prime is 198778858799077. The reversal of 198778858799067 is 760997858877891.

198778858799067 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 7 + 8 + 8 + 587 + 9 + 9 + 0 + 6 + 7 = 666.

It is not a de Polignac number, because 198778858799067 - 2¹¹ = 198778858797019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198778858799077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211112598 + ... + 212052084.

It is an arithmetic number, because the mean of its divisors is an integer number (9226382827200).

Almost surely, 2^{198778858799067} is an apocalyptic number.

198778858799067 is a deficient number, since it is larger than the sum of its proper divisors (96465391671333).

198778858799067 is a wasteful number, since it uses less digits than its factorization.

198778858799067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959632 (or 959626 counting only the distinct ones).

The product of its (nonzero) digits is 215080427520, while the sum is 99.

The spelling of 198778858799067 in words is "one hundred ninety-eight trillion, seven hundred seventy-eight billion, eight hundred fifty-eight million, seven hundred ninety-nine thousand, sixty-seven".