666694 has 12 divisors (see below), whose sum is σ = 1163484. Its totient is φ = 285684.

The previous prime is 666683. The next prime is 666697. The reversal of 666694 is 496666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3304 + ... + 3499.

It is an arithmetic number, because the mean of its divisors is an integer number (96957).

2⁶⁶⁶⁶⁹⁴ is an apocalyptic number.

666694 is a deficient number, since it is larger than the sum of its proper divisors (496790).

666694 is a wasteful number, since it uses less digits than its factorization.

666694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819 (or 6812 counting only the distinct ones).

The product of its digits is 46656, while the sum is 37.

The square root of 666694 is about 816.5133189361. The cubic root of 666694 is about 87.3592403506.

The spelling of 666694 in words is "six hundred sixty-six thousand, six hundred ninety-four".