161678 has 8 divisors (see below), whose sum is σ = 264600. Its totient is φ = 73480.

The previous prime is 161659. The next prime is 161683. The reversal of 161678 is 876161.

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

It is a super-2 number, since 2×161678² = 52279551368, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 161678.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3653 + ... + 3696.

It is an arithmetic number, because the mean of its divisors is an integer number (33075).

2¹⁶¹⁶⁷⁸ is an apocalyptic number.

161678 is a deficient number, since it is larger than the sum of its proper divisors (102922).

161678 is a wasteful number, since it uses less digits than its factorization.

161678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7362.

The product of its digits is 2016, while the sum is 29.

The square root of 161678 is about 402.0920292669. The cubic root of 161678 is about 54.4774757524.

The spelling of 161678 in words is "one hundred sixty-one thousand, six hundred seventy-eight".