198665856 has 96 divisors (see below), whose sum is σ = 590229120. Its totient is φ = 64074240.

The previous prime is 198665833. The next prime is 198665897. The reversal of 198665856 is 658566891.

It is a happy number.

198665856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

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, 32931 + ... + 38493.

It is an arithmetic number, because the mean of its divisors is an integer number (6148220).

Almost surely, 2^198665856 is an apocalyptic number.

198665856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198665856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295114560).

198665856 is an abundant number, since it is smaller than the sum of its proper divisors (391563264).

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

198665856 is a wasteful number, since it uses less digits than its factorization.

198665856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614 (or 5599 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 198665856 is about 14094.8875838014. The cubic root of 198665856 is about 583.5002918739.

The spelling of 198665856 in words is "one hundred ninety-eight million, six hundred sixty-five thousand, eight hundred fifty-six".