166644 has 24 divisors (see below), whose sum is σ = 432320. Its totient is φ = 55512.

The previous prime is 166643. The next prime is 166657. The reversal of 166644 is 446661.

166644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166643) 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, 664 + ... + 879.

2¹⁶⁶⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

166644 is an abundant number, since it is smaller than the sum of its proper divisors (265676).

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

166644 is a wasteful number, since it uses less digits than its factorization.

166644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556 (or 1548 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 166644 is about 408.2205286362. The cubic root of 166644 is about 55.0296259123.

The spelling of 166644 in words is "one hundred sixty-six thousand, six hundred forty-four".