666696 has 16 divisors (see below), whose sum is σ = 1666800. Its totient is φ = 222224.

The previous prime is 666683. The next prime is 666697. The reversal of 666696 is 696666.

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

666696 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, 13866 + ... + 13913.

It is an arithmetic number, because the mean of its divisors is an integer number (104175).

2⁶⁶⁶⁶⁹⁶ is an apocalyptic number.

It is an amenable number.

666696 is an abundant number, since it is smaller than the sum of its proper divisors (1000104).

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

666696 is a wasteful number, since it uses less digits than its factorization.

666696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27788 (or 27784 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 666696 is about 816.5145436549. The cubic root of 666696 is about 87.3593277062.

It can be divided in two parts, 6666 and 96, that multiplied together give a palindrome (639936).

The spelling of 666696 in words is "six hundred sixty-six thousand, six hundred ninety-six".