666596 has 36 divisors (see below), whose sum is σ = 1436400. Its totient is φ = 269136.

The previous prime is 666559. The next prime is 666599. The reversal of 666596 is 695666.

666596 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

Its product of digits (58320) is a multiple of the sum of its prime factors (216).

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (666599) by changing a digit.

666596 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 11 ways as a sum of consecutive naturals, for example, 3635 + ... + 3813.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2⁶⁶⁶⁵⁹⁶ 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 666596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718200).

666596 is an abundant number, since it is smaller than the sum of its proper divisors (769804).

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

666596 is a wasteful number, since it uses less digits than its factorization.

666596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 207 counting only the distinct ones).

The product of its digits is 58320, while the sum is 38.

The square root of 666596 is about 816.4533054621. The cubic root of 666596 is about 87.3549597136.

The spelling of 666596 in words is "six hundred sixty-six thousand, five hundred ninety-six".