198908661 has 8 divisors (see below), whose sum is σ = 303098944. Its totient is φ = 113662080.

The previous prime is 198908657. The next prime is 198908719. The reversal of 198908661 is 166809891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198908661 - 2² = 198908657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198908661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198908621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4735900 + ... + 4735941.

It is an arithmetic number, because the mean of its divisors is an integer number (37887368).

Almost surely, 2^198908661 is an apocalyptic number.

It is an amenable number.

198908661 is a deficient number, since it is larger than the sum of its proper divisors (104190283).

198908661 is an equidigital number, since it uses as much as digits as its factorization.

198908661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471851.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 198908661 is about 14103.4981830750. The cubic root of 198908661 is about 583.7379087989.

The spelling of 198908661 in words is "one hundred ninety-eight million, nine hundred eight thousand, six hundred sixty-one".