198655881 has 16 divisors (see below), whose sum is σ = 267724800. Its totient is φ = 131019408.

The previous prime is 198655859. The next prime is 198655901. The reversal of 198655881 is 188556891.

It is not a de Polignac number, because 198655881 - 2⁶ = 198655817 is a prime.

It is a super-2 number, since 2×198655881² = 78928318111772322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198651881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149040 + ... + 150366.

It is an arithmetic number, because the mean of its divisors is an integer number (16732800).

Almost surely, 2^198655881 is an apocalyptic number.

It is an amenable number.

198655881 is a deficient number, since it is larger than the sum of its proper divisors (69068919).

198655881 is a wasteful number, since it uses less digits than its factorization.

198655881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its digits is 691200, while the sum is 51.

The square root of 198655881 is about 14094.5337276548. The cubic root of 198655881 is about 583.4905258729.

The spelling of 198655881 in words is "one hundred ninety-eight million, six hundred fifty-five thousand, eight hundred eighty-one".