161718 has 8 divisors (see below), whose sum is σ = 323448. Its totient is φ = 53904.

The previous prime is 161717. The next prime is 161729. The reversal of 161718 is 817161.

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

161718 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161717) 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, 13471 + ... + 13482.

It is an arithmetic number, because the mean of its divisors is an integer number (40431).

2¹⁶¹⁷¹⁸ is an apocalyptic number.

161718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161718 is a wasteful number, since it uses less digits than its factorization.

161718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26958.

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

The square root of 161718 is about 402.1417660477. The cubic root of 161718 is about 54.4819680547.

Adding to 161718 its reverse (817161), we get a palindrome (978879).

The spelling of 161718 in words is "one hundred sixty-one thousand, seven hundred eighteen".