198542665 has 8 divisors (see below), whose sum is σ = 238432968. Its totient is φ = 158712960.

The previous prime is 198542657. The next prime is 198542749. The reversal of 198542665 is 566245891.

198542665 = 9963² + 9964².

198542665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 99261369 + 99281296 = 9963^2 + 9964^2 .

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

It is not a de Polignac number, because 198542665 - 2³ = 198542657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7596 + ... + 21325.

It is an arithmetic number, because the mean of its divisors is an integer number (29804121).

Almost surely, 2^198542665 is an apocalyptic number.

198542665 is the 9964-th centered square number.

It is an amenable number.

198542665 is a deficient number, since it is larger than the sum of its proper divisors (39890303).

198542665 is a wasteful number, since it uses less digits than its factorization.

198542665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30299.

The product of its digits is 518400, while the sum is 46.

The square root of 198542665 is about 14090.5168464468. The cubic root of 198542665 is about 583.3796590874.

The spelling of 198542665 in words is "one hundred ninety-eight million, five hundred forty-two thousand, six hundred sixty-five".