666080 has 48 divisors (see below), whose sum is σ = 1651104. Its totient is φ = 253440.

The previous prime is 666079. The next prime is 666089. The reversal of 666080 is 80666.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666080.

It is not an unprimeable number, because it can be changed into a prime (666089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3590 + ... + 3770.

It is an arithmetic number, because the mean of its divisors is an integer number (34398).

2⁶⁶⁶⁰⁸⁰ 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 666080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825552).

666080 is an abundant number, since it is smaller than the sum of its proper divisors (985024).

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

666080 is a wasteful number, since it uses less digits than its factorization.

666080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 666080 is about 816.1372433605. The cubic root of 666080 is about 87.3324139263.

The spelling of 666080 in words is "six hundred sixty-six thousand, eighty".