660166 has 8 divisors (see below), whose sum is σ = 1066464. Its totient is φ = 304680.

The previous prime is 660157. The next prime is 660167. The reversal of 660166 is 661066.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 660166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660167) by changing a digit.

660166 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 3 ways as a sum of consecutive naturals, for example, 12670 + ... + 12721.

It is an arithmetic number, because the mean of its divisors is an integer number (133308).

2⁶⁶⁰¹⁶⁶ is an apocalyptic number.

660166 is a deficient number, since it is larger than the sum of its proper divisors (406298).

660166 is a wasteful number, since it uses less digits than its factorization.

660166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25406.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 660166 is about 812.5059999778. The cubic root of 660166 is about 87.0731757623.

Subtracting 660166 from its reverse (661066), we obtain a square (900 = 30²).

The spelling of 660166 in words is "six hundred sixty thousand, one hundred sixty-six".