198955665 has 12 divisors (see below), whose sum is σ = 344856564. Its totient is φ = 106109664.

The previous prime is 198955661. The next prime is 198955667. The reversal of 198955665 is 566559891.

198955665 is a `hidden beast` number, since 1 + 9 + 89 + 556 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 125955729 + 72999936 = 11223^2 + 8544^2 .

It is not a de Polignac number, because 198955665 - 2² = 198955661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198955661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2210574 + ... + 2210663.

It is an arithmetic number, because the mean of its divisors is an integer number (28738047).

Almost surely, 2^198955665 is an apocalyptic number.

198955665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198955665 is a deficient number, since it is larger than the sum of its proper divisors (145900899).

198955665 is a wasteful number, since it uses less digits than its factorization.

198955665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421248 (or 4421245 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The square root of 198955665 is about 14105.1644797216. The cubic root of 198955665 is about 583.7838861092.

The spelling of 198955665 in words is "one hundred ninety-eight million, nine hundred fifty-five thousand, six hundred sixty-five".