198487126081 has 4 divisors (see below), whose sum is σ = 207117001152. Its totient is φ = 189857251012.

The previous prime is 198487126069. The next prime is 198487126091. The reversal of 198487126081 is 180621784891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180621784891 = 359 ⋅503124749.

It is a cyclic number.

It is not a de Polignac number, because 198487126081 - 2⁹ = 198487125569 is a prime.

It is a super-2 number, since 2×198487126081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198487126051) 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, 4314937501 + ... + 4314937546.

It is an arithmetic number, because the mean of its divisors is an integer number (51779250288).

Almost surely, 2^198487126081 is an apocalyptic number.

It is an amenable number.

198487126081 is a deficient number, since it is larger than the sum of its proper divisors (8629875071).

198487126081 is an equidigital number, since it uses as much as digits as its factorization.

198487126081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8629875070.

The product of its (nonzero) digits is 1548288, while the sum is 55.

The spelling of 198487126081 in words is "one hundred ninety-eight billion, four hundred eighty-seven million, one hundred twenty-six thousand, eighty-one".