198540065 has 16 divisors (see below), whose sum is σ = 240659328. Its totient is φ = 157234176.

The previous prime is 198540049. The next prime is 198540077. The reversal of 198540065 is 560045891.

It is a cyclic number.

It is not a de Polignac number, because 198540065 - 2⁴ = 198540049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272732 + ... + 273458.

It is an arithmetic number, because the mean of its divisors is an integer number (15041208).

Almost surely, 2^198540065 is an apocalyptic number.

It is an amenable number.

198540065 is a deficient number, since it is larger than the sum of its proper divisors (42119263).

198540065 is a wasteful number, since it uses less digits than its factorization.

198540065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 198540065 is about 14090.4245855120. The cubic root of 198540065 is about 583.3771125419.

The spelling of 198540065 in words is "one hundred ninety-eight million, five hundred forty thousand, sixty-five".