166655 has 4 divisors (see below), whose sum is σ = 199992. Its totient is φ = 133320.

The previous prime is 166643. The next prime is 166657. The reversal of 166655 is 556661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166655 - 2⁸ = 166399 is a prime.

It is a Duffinian 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 (166657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16661 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (49998).

2¹⁶⁶⁶⁵⁵ is an apocalyptic number.

166655 is a deficient number, since it is larger than the sum of its proper divisors (33337).

166655 is an equidigital number, since it uses as much as digits as its factorization.

166655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33336.

The product of its digits is 5400, while the sum is 29.

The square root of 166655 is about 408.2340015236. The cubic root of 166655 is about 55.0308367021.

The spelling of 166655 in words is "one hundred sixty-six thousand, six hundred fifty-five".