666963 has 12 divisors (see below), whose sum is σ = 1051128. Its totient is φ = 404160.

The previous prime is 666959. The next prime is 666979. The reversal of 666963 is 369666.

666963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666963 - 2² = 666959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666983) 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, 3270 + ... + 3467.

It is an arithmetic number, because the mean of its divisors is an integer number (87594).

2⁶⁶⁶⁹⁶³ is an apocalyptic number.

666963 is a deficient number, since it is larger than the sum of its proper divisors (384165).

666963 is a wasteful number, since it uses less digits than its factorization.

666963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6754 (or 6751 counting only the distinct ones).

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

The square root of 666963 is about 816.6780271319. The cubic root of 666963 is about 87.3709881069.

The spelling of 666963 in words is "six hundred sixty-six thousand, nine hundred sixty-three".