198957166 has 4 divisors (see below), whose sum is σ = 298435752. Its totient is φ = 99478582.

The previous prime is 198957091. The next prime is 198957221. The reversal of 198957166 is 661759891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49739290 + ... + 49739293.

It is an arithmetic number, because the mean of its divisors is an integer number (74608938).

Almost surely, 2^198957166 is an apocalyptic number.

198957166 is a deficient number, since it is larger than the sum of its proper divisors (99478586).

198957166 is an equidigital number, since it uses as much as digits as its factorization.

198957166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99478585.

The product of its digits is 816480, while the sum is 52.

The square root of 198957166 is about 14105.2176870830. The cubic root of 198957166 is about 583.7853542041.

The spelling of 198957166 in words is "one hundred ninety-eight million, nine hundred fifty-seven thousand, one hundred sixty-six".