161668 has 12 divisors (see below), whose sum is σ = 304780. Its totient is φ = 74592.

The previous prime is 161659. The next prime is 161683. The reversal of 161668 is 866161.

161668 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 2 ways, for example, as 26244 + 135424 = 162^2 + 368^2 .

It is a super-2 number, since 2×161668² = 52273084448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503 + ... + 1606.

2¹⁶¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

161668 is a deficient number, since it is larger than the sum of its proper divisors (143112).

161668 is a wasteful number, since it uses less digits than its factorization.

161668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3126 (or 3124 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 161668 is about 402.0795941104. The cubic root of 161668 is about 54.4763525611.

The spelling of 161668 in words is "one hundred sixty-one thousand, six hundred sixty-eight".