198186720169 has 4 divisors (see below), whose sum is σ = 202403458944. Its totient is φ = 193969981396.

The previous prime is 198186720167. The next prime is 198186720203. The reversal of 198186720169 is 961027681891.

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.

It is a cyclic number.

It is not a de Polignac number, because 198186720169 - 2¹ = 198186720167 is a prime.

It is a super-2 number, since 2×198186720169² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198186720167) 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, 2108369317 + ... + 2108369410.

It is an arithmetic number, because the mean of its divisors is an integer number (50600864736).

Almost surely, 2^198186720169 is an apocalyptic number.

It is an amenable number.

198186720169 is a deficient number, since it is larger than the sum of its proper divisors (4216738775).

198186720169 is an equidigital number, since it uses as much as digits as its factorization.

198186720169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216738774.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 198186720169 in words is "one hundred ninety-eight billion, one hundred eighty-six million, seven hundred twenty thousand, one hundred sixty-nine".