161800017 has 4 divisors (see below), whose sum is σ = 215733360. Its totient is φ = 107866676.

The previous prime is 161799997. The next prime is 161800073. The reversal of 161800017 is 710008161.

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: 710008161 = 3 ⋅236669387.

It is a cyclic number.

It is not a de Polignac number, because 161800017 - 2¹⁰ = 161798993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161800017.

It is not an unprimeable number, because it can be changed into a prime (161800087) 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, 26966667 + ... + 26966672.

It is an arithmetic number, because the mean of its divisors is an integer number (53933340).

Almost surely, 2^161800017 is an apocalyptic number.

It is an amenable number.

161800017 is a deficient number, since it is larger than the sum of its proper divisors (53933343).

161800017 is an equidigital number, since it uses as much as digits as its factorization.

161800017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53933342.

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 161800017 is about 12720.0635611619. The cubic root of 161800017 is about 544.9117686756.

Adding to 161800017 its reverse (710008161), we get a palindrome (871808178).

The spelling of 161800017 in words is "one hundred sixty-one million, eight hundred thousand, seventeen".