666700 has 36 divisors (see below), whose sum is σ = 1484280. Its totient is φ = 259840.

The previous prime is 666697. The next prime is 666707. The reversal of 666700 is 7666.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (666707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5844 + ... + 5956.

It is an arithmetic number, because the mean of its divisors is an integer number (41230).

2⁶⁶⁶⁷⁰⁰ 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 666700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742140).

666700 is an abundant number, since it is smaller than the sum of its proper divisors (817580).

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

666700 is a wasteful number, since it uses less digits than its factorization.

666700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 666700 is about 816.5169930871. The cubic root of 666700 is about 87.3595024168.

The spelling of 666700 in words is "six hundred sixty-six thousand, seven hundred".