166653 has 6 divisors (see below), whose sum is σ = 240734. Its totient is φ = 111096.

The previous prime is 166643. The next prime is 166657. The reversal of 166653 is 356661.

It can be written as a sum of positive squares in only one way, i.e., 127449 + 39204 = 357^2 + 198^2 .

It is not a de Polignac number, because 166653 - 2¹² = 162557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166657) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 9250 + ... + 9267.

2¹⁶⁶⁶⁵³ is an apocalyptic number.

It is an amenable number.

166653 is a deficient number, since it is larger than the sum of its proper divisors (74081).

166653 is a wasteful number, since it uses less digits than its factorization.

166653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18523 (or 18520 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 166653 is about 408.2315519408. The cubic root of 166653 is about 55.0306165625.

The spelling of 166653 in words is "one hundred sixty-six thousand, six hundred fifty-three".