195445166409 has 10 divisors (see below), whose sum is σ = 291961298090. Its totient is φ = 130296777552.

The previous prime is 195445166393. The next prime is 195445166417. The reversal of 195445166409 is 904661544591.

195445166409 is a `hidden beast` number, since 1 + 9 + 544 + 51 + 6 + 6 + 40 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 185715316809 + 9729849600 = 430947^2 + 98640^2 .

It is not a de Polignac number, because 195445166409 - 2⁴ = 195445166393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195445166309) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1206451564 + ... + 1206451725.

It is an arithmetic number, because the mean of its divisors is an integer number (29196129809).

Almost surely, 2^195445166409 is an apocalyptic number.

It is an amenable number.

195445166409 is a deficient number, since it is larger than the sum of its proper divisors (96516131681).

195445166409 is an equidigital number, since it uses as much as digits as its factorization.

195445166409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412903301 (or 2412903292 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 195445166409 in words is "one hundred ninety-five billion, four hundred forty-five million, one hundred sixty-six thousand, four hundred nine".