663967 has 2 divisors, whose sum is σ = 663968. Its totient is φ = 663966.

The previous prime is 663961. The next prime is 663973. The reversal of 663967 is 769366.

663967 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (663961) and next prime (663973).

It is a cyclic number.

It is not a de Polignac number, because 663967 - 2³ = 663959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331983 + 331984.

It is an arithmetic number, because the mean of its divisors is an integer number (331984).

2⁶⁶³⁹⁶⁷ is an apocalyptic number.

663967 is a deficient number, since it is larger than the sum of its proper divisors (1).

663967 is an equidigital number, since it uses as much as digits as its factorization.

663967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 663967 is about 814.8417024183. The cubic root of 663967 is about 87.2399681408.

The spelling of 663967 in words is "six hundred sixty-three thousand, nine hundred sixty-seven".