161117222015 has 8 divisors (see below), whose sum is σ = 194352922368. Its totient is φ = 128218940320.

The previous prime is 161117222011. The next prime is 161117222023. The reversal of 161117222015 is 510222711161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161117222015 - 2² = 161117222011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161117222011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84353612 + ... + 84355521.

It is an arithmetic number, because the mean of its divisors is an integer number (24294115296).

Almost surely, 2^161117222015 is an apocalyptic number.

161117222015 is a deficient number, since it is larger than the sum of its proper divisors (33235700353).

161117222015 is a wasteful number, since it uses less digits than its factorization.

161117222015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168709329.

The product of its (nonzero) digits is 1680, while the sum is 29.

Adding to 161117222015 its reverse (510222711161), we get a palindrome (671339933176).

The spelling of 161117222015 in words is "one hundred sixty-one billion, one hundred seventeen million, two hundred twenty-two thousand, fifteen".