161966 has 16 divisors (see below), whose sum is σ = 290304. Its totient is φ = 66264.

The previous prime is 161957. The next prime is 161969. The reversal of 161966 is 669161.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161969) by changing a digit.

161966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (18144).

2¹⁶¹⁹⁶⁶ is an apocalyptic number.

161966 is a deficient number, since it is larger than the sum of its proper divisors (128338).

161966 is a wasteful number, since it uses less digits than its factorization.

161966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its digits is 1944, while the sum is 29.

The square root of 161966 is about 402.4499968940. The cubic root of 161966 is about 54.5098038082.

The spelling of 161966 in words is "one hundred sixty-one thousand, nine hundred sixty-six".