198551698559 has 4 divisors (see below), whose sum is σ = 198552595704. Its totient is φ = 198550801416.

The previous prime is 198551698517. The next prime is 198551698567. The reversal of 198551698559 is 955896155891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 955896155891 = 8311 ⋅115015781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198551698559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198551698492 and 198551698501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198551698859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146849 + ... + 647045.

It is an arithmetic number, because the mean of its divisors is an integer number (49638148926).

Almost surely, 2^198551698559 is an apocalyptic number.

198551698559 is a deficient number, since it is larger than the sum of its proper divisors (897145).

198551698559 is an equidigital number, since it uses as much as digits as its factorization.

198551698559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897144.

The product of its digits is 174960000, while the sum is 71.

The spelling of 198551698559 in words is "one hundred ninety-eight billion, five hundred fifty-one million, six hundred ninety-eight thousand, five hundred fifty-nine".