198163657 has 8 divisors (see below), whose sum is σ = 200470400. Its totient is φ = 195864480.

The previous prime is 198163649. The next prime is 198163681. The reversal of 198163657 is 756361891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 198163657 - 2³ = 198163649 is a prime.

It is a super-2 number, since 2×198163657² = 78537669911227298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198563657) 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, 63469 + ... + 66517.

It is an arithmetic number, because the mean of its divisors is an integer number (25058800).

Almost surely, 2^198163657 is an apocalyptic number.

It is an amenable number.

198163657 is a deficient number, since it is larger than the sum of its proper divisors (2306743).

198163657 is a wasteful number, since it uses less digits than its factorization.

198163657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783.

The product of its digits is 272160, while the sum is 46.

The square root of 198163657 is about 14077.0613765800. The cubic root of 198163657 is about 583.0082084466.

The spelling of 198163657 in words is "one hundred ninety-eight million, one hundred sixty-three thousand, six hundred fifty-seven".