198166535 has 40 divisors (see below), whose sum is σ = 294037776. Its totient is φ = 127760640.

The previous prime is 198166531. The next prime is 198166537. The reversal of 198166535 is 535661891.

It is not a de Polignac number, because 198166535 - 2² = 198166531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198166531) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 203600 + ... + 204570.

Almost surely, 2^198166535 is an apocalyptic number.

198166535 is a deficient number, since it is larger than the sum of its proper divisors (95871241).

198166535 is an frugal number, since it uses more digits than its factorization.

198166535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 1000 counting only the distinct ones).

The product of its digits is 194400, while the sum is 44.

The square root of 198166535 is about 14077.1635992483. The cubic root of 198166535 is about 583.0110308436.

The spelling of 198166535 in words is "one hundred ninety-eight million, one hundred sixty-six thousand, five hundred thirty-five".