666160 has 40 divisors (see below), whose sum is σ = 1691856. Its totient is φ = 241920.

The previous prime is 666143. The next prime is 666167. The reversal of 666160 is 61666.

It is a tau number, because it is divible by the number of its divisors (40).

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (666167) by changing a digit.

It is a nontrivial repunit in base 87.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502 + ... + 1258.

2⁶⁶⁶¹⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845928).

666160 is an abundant number, since it is smaller than the sum of its proper divisors (1025696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666160 is a wasteful number, since it uses less digits than its factorization.

666160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 775 counting only the distinct ones).

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

The square root of 666160 is about 816.1862532535. The cubic root of 666160 is about 87.3359101597.

It can be divided in two parts, 66 and 6160, that added together give a palindrome (6226).

The spelling of 666160 in words is "six hundred sixty-six thousand, one hundred sixty".