666692 has 12 divisors (see below), whose sum is σ = 1256556. Its totient is φ = 307680.

The previous prime is 666683. The next prime is 666697. The reversal of 666692 is 296666.

It can be written as a sum of positive squares in 2 ways, for example, as 64516 + 602176 = 254^2 + 776^2 .

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

666692 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6359 + ... + 6462.

It is an arithmetic number, because the mean of its divisors is an integer number (104713).

2⁶⁶⁶⁶⁹² is an apocalyptic number.

It is an amenable number.

666692 is a deficient number, since it is larger than the sum of its proper divisors (589864).

666692 is a wasteful number, since it uses less digits than its factorization.

666692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838 (or 12836 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 666692 is about 816.5120942154. The cubic root of 666692 is about 87.3591529949.

The spelling of 666692 in words is "six hundred sixty-six thousand, six hundred ninety-two".