166766 has 4 divisors (see below), whose sum is σ = 250152. Its totient is φ = 83382.

The previous prime is 166741. The next prime is 166781. The reversal of 166766 is 667661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 667661 = 43 ⋅15527.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41690 + ... + 41693.

It is an arithmetic number, because the mean of its divisors is an integer number (62538).

2¹⁶⁶⁷⁶⁶ is an apocalyptic number.

166766 is a deficient number, since it is larger than the sum of its proper divisors (83386).

166766 is an equidigital number, since it uses as much as digits as its factorization.

166766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83385.

The product of its digits is 9072, while the sum is 32.

The square root of 166766 is about 408.3699303328. The cubic root of 166766 is about 55.0430516916.

The spelling of 166766 in words is "one hundred sixty-six thousand, seven hundred sixty-six".