198885556820 has 18 divisors (see below), whose sum is σ = 417663857646. Its totient is φ = 79553424960.

The previous prime is 198885556787. The next prime is 198885556897. The reversal of 198885556820 is 28655588891.

It can be written as a sum of positive squares in 3 ways, for example, as 9192207376 + 189693349444 = 95876^2 + 435538^2 .

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1944560 + ... + 2044280.

It is an arithmetic number, because the mean of its divisors is an integer number (23203547647).

Almost surely, 2^198885556820 is an apocalyptic number.

198885556820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198885556820 is an abundant number, since it is smaller than the sum of its proper divisors (218778300826).

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

198885556820 is an frugal number, since it uses more digits than its factorization.

198885556820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199451 (or 99728 counting only the distinct ones).

The product of its (nonzero) digits is 55296000, while the sum is 65.

The spelling of 198885556820 in words is "one hundred ninety-eight billion, eight hundred eighty-five million, five hundred fifty-six thousand, eight hundred twenty".