166550 has 12 divisors (see below), whose sum is σ = 309876. Its totient is φ = 66600.

The previous prime is 166541. The next prime is 166561. The reversal of 166550 is 55661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

166550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1616 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (25823).

2¹⁶⁶⁵⁵⁰ is an apocalyptic number.

166550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166550 is a deficient number, since it is larger than the sum of its proper divisors (143326).

166550 is a wasteful number, since it uses less digits than its factorization.

166550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343 (or 3338 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 166550 is about 408.1053785482. The cubic root of 166550 is about 55.0192769894.

Subtracting from 166550 its reverse (55661), we obtain a square (110889 = 333²).

The spelling of 166550 in words is "one hundred sixty-six thousand, five hundred fifty".