666594 has 24 divisors (see below), whose sum is σ = 1495260. Its totient is φ = 214368.

The previous prime is 666559. The next prime is 666599. The reversal of 666594 is 495666.

It is a happy number.

666594 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 660969 + 5625 = 813^2 + 75^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (666599) 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, 117 + ... + 1160.

2⁶⁶⁶⁵⁹⁴ is an apocalyptic number.

666594 is an abundant number, since it is smaller than the sum of its proper divisors (828666).

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

666594 is a wasteful number, since it uses less digits than its factorization.

666594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314 (or 1311 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 666594 is about 816.4520806514. The cubic root of 666594 is about 87.3548723493.

The spelling of 666594 in words is "six hundred sixty-six thousand, five hundred ninety-four".