161117222005 has 8 divisors (see below), whose sum is σ = 196988603832. Its totient is φ = 126461819328.

The previous prime is 161117221997. The next prime is 161117222011. The reversal of 161117222005 is 500222711161.

161117222005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 27543053521 + 133574168484 = 165961^2 + 365478^2 .

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 161117222005 - 2³ = 161117221997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303994494 + ... + 303995023.

It is an arithmetic number, because the mean of its divisors is an integer number (24623575479).

Almost surely, 2^161117222005 is an apocalyptic number.

It is an amenable number.

161117222005 is a deficient number, since it is larger than the sum of its proper divisors (35871381827).

161117222005 is an equidigital number, since it uses as much as digits as its factorization.

161117222005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607989575.

The product of its (nonzero) digits is 1680, while the sum is 28.

Adding to 161117222005 its reverse (500222711161), we get a palindrome (661339933166).

The spelling of 161117222005 in words is "one hundred sixty-one billion, one hundred seventeen million, two hundred twenty-two thousand, five".