198040661 has 8 divisors (see below), whose sum is σ = 243742464. Its totient is φ = 156691440.

The previous prime is 198040643. The next prime is 198040669. The reversal of 198040661 is 166040891.

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-198040661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198040669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088045 + ... + 1088226.

It is an arithmetic number, because the mean of its divisors is an integer number (30467808).

Almost surely, 2^198040661 is an apocalyptic number.

It is an amenable number.

198040661 is a deficient number, since it is larger than the sum of its proper divisors (45701803).

198040661 is a wasteful number, since it uses less digits than its factorization.

198040661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176291.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 198040661 is about 14072.6920310224. The cubic root of 198040661 is about 582.8875631853.

The spelling of 198040661 in words is "one hundred ninety-eight million, forty thousand, six hundred sixty-one".