198557455 has 4 divisors (see below), whose sum is σ = 238268952. Its totient is φ = 158845960.

The previous prime is 198557441. The next prime is 198557477. The reversal of 198557455 is 554755891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554755891 = 311 ⋅1783781.

It is not a de Polignac number, because 198557455 - 2⁵ = 198557423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198557399 and 198557408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19855741 + ... + 19855750.

It is an arithmetic number, because the mean of its divisors is an integer number (59567238).

Almost surely, 2^198557455 is an apocalyptic number.

198557455 is a deficient number, since it is larger than the sum of its proper divisors (39711497).

198557455 is an equidigital number, since it uses as much as digits as its factorization.

198557455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39711496.

The product of its digits is 1260000, while the sum is 49.

The square root of 198557455 is about 14091.0416577342. The cubic root of 198557455 is about 583.3941445900.

The spelling of 198557455 in words is "one hundred ninety-eight million, five hundred fifty-seven thousand, four hundred fifty-five".