198618975601 has 8 divisors (see below), whose sum is σ = 211061664360. Its totient is φ = 186260644608.

The previous prime is 198618975571. The next prime is 198618975677. The reversal of 198618975601 is 106579816891.

It can be written as a sum of positive squares in 4 ways, for example, as 11842880625 + 186776094976 = 108825^2 + 432176^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 198618975601 - 2⁷ = 198618975473 is a prime.

It is a super-2 number, since 2×198618975601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198618975601.

It is not an unprimeable number, because it can be changed into a prime (198618975901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21084586 + ... + 21094003.

It is an arithmetic number, because the mean of its divisors is an integer number (26382708045).

Almost surely, 2^198618975601 is an apocalyptic number.

It is an amenable number.

198618975601 is a deficient number, since it is larger than the sum of its proper divisors (12442688759).

198618975601 is a wasteful number, since it uses less digits than its factorization.

198618975601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42178883.

The product of its (nonzero) digits is 6531840, while the sum is 61.

The spelling of 198618975601 in words is "one hundred ninety-eight billion, six hundred eighteen million, nine hundred seventy-five thousand, six hundred one".