161646 has 16 divisors (see below), whose sum is σ = 334800. Its totient is φ = 51968.

The previous prime is 161641. The next prime is 161659. The reversal of 161646 is 646161.

It is a super-2 number, since 2×161646² = 52258858632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291 + ... + 638.

It is an arithmetic number, because the mean of its divisors is an integer number (20925).

2¹⁶¹⁶⁴⁶ is an apocalyptic number.

161646 is an abundant number, since it is smaller than the sum of its proper divisors (173154).

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

161646 is a wasteful number, since it uses less digits than its factorization.

161646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963.

The product of its digits is 864, while the sum is 24.

The square root of 161646 is about 402.0522354123. The cubic root of 161646 is about 54.4738813771.

The spelling of 161646 in words is "one hundred sixty-one thousand, six hundred forty-six".