198778858799069 has 8 divisors (see below), whose sum is σ = 209980271156640. Its totient is φ = 187651383157296.

The previous prime is 198778858799021. The next prime is 198778858799077. The reversal of 198778858799069 is 960997858877891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198778858799069 is a prime.

It is a super-2 number, since 2×198778858799069² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198778858799069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198778858799009) 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 7 ways as a sum of consecutive naturals, for example, 18484173422 + ... + 18484184175.

It is an arithmetic number, because the mean of its divisors is an integer number (26247533894580).

Almost surely, 2^{198778858799069} is an apocalyptic number.

198778858799069 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

198778858799069 is a deficient number, since it is larger than the sum of its proper divisors (11201412357571).

198778858799069 is a wasteful number, since it uses less digits than its factorization.

198778858799069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36968357899.

The product of its (nonzero) digits is 276531978240, while the sum is 101.

The spelling of 198778858799069 in words is "one hundred ninety-eight trillion, seven hundred seventy-eight billion, eight hundred fifty-eight million, seven hundred ninety-nine thousand, sixty-nine".