161117615 has 8 divisors (see below), whose sum is σ = 196989408. Its totient is φ = 126461920.

The previous prime is 161117611. The next prime is 161117623. The reversal of 161117615 is 516711161.

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

It is not a de Polignac number, because 161117615 - 2² = 161117611 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 (161117611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303731 + ... + 304260.

It is an arithmetic number, because the mean of its divisors is an integer number (24623676).

Almost surely, 2^161117615 is an apocalyptic number.

161117615 is a deficient number, since it is larger than the sum of its proper divisors (35871793).

161117615 is an equidigital number, since it uses as much as digits as its factorization.

161117615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608049.

The product of its digits is 1260, while the sum is 29.

The square root of 161117615 is about 12693.2113745892. The cubic root of 161117615 is about 544.1446223313.

Adding to 161117615 its reverse (516711161), we get a palindrome (677828776).

The spelling of 161117615 in words is "one hundred sixty-one million, one hundred seventeen thousand, six hundred fifteen".