165566 has 8 divisors (see below), whose sum is σ = 261480. Its totient is φ = 78408.

The previous prime is 165559. The next prime is 165569. The reversal of 165566 is 665561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165569) 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, 2141 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (32685).

2¹⁶⁵⁵⁶⁶ is an apocalyptic number.

165566 is a deficient number, since it is larger than the sum of its proper divisors (95914).

165566 is a wasteful number, since it uses less digits than its factorization.

165566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378.

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

The square root of 165566 is about 406.8980216221. The cubic root of 165566 is about 54.9107091118.

The spelling of 165566 in words is "one hundred sixty-five thousand, five hundred sixty-six".