198042509959 has 4 divisors (see below), whose sum is σ = 226334297104. Its totient is φ = 169750722816.

The previous prime is 198042509939. The next prime is 198042509983. The reversal of 198042509959 is 959905240891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959905240891 = 313 ⋅3066789907.

It is a cyclic number.

It is not a de Polignac number, because 198042509959 - 2⁵ = 198042509927 is a prime.

It is a super-2 number, since 2×198042509959² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198042509897 and 198042509906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198042509909) 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, 14145893562 + ... + 14145893575.

It is an arithmetic number, because the mean of its divisors is an integer number (56583574276).

Almost surely, 2^198042509959 is an apocalyptic number.

198042509959 is a deficient number, since it is larger than the sum of its proper divisors (28291787145).

198042509959 is an equidigital number, since it uses as much as digits as its factorization.

198042509959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28291787144.

The product of its (nonzero) digits is 10497600, while the sum is 61.

The spelling of 198042509959 in words is "one hundred ninety-eight billion, forty-two million, five hundred nine thousand, nine hundred fifty-nine".