666693 has 6 divisors (see below), whose sum is σ = 963014. Its totient is φ = 444456.

The previous prime is 666683. The next prime is 666697. The reversal of 666693 is 396666.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 173889 = 702^2 + 417^2 .

It is not a de Polignac number, because 666693 - 2⁸ = 666437 is a prime.

It is a Duffinian number.

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, 37030 + ... + 37047.

2⁶⁶⁶⁶⁹³ is an apocalyptic number.

It is an amenable number.

666693 is a deficient number, since it is larger than the sum of its proper divisors (296321).

666693 is a wasteful number, since it uses less digits than its factorization.

666693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74083 (or 74080 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 666693 is about 816.5127065760. The cubic root of 666693 is about 87.3591966728.

The spelling of 666693 in words is "six hundred sixty-six thousand, six hundred ninety-three".