663907 has 2 divisors, whose sum is σ = 663908. Its totient is φ = 663906.

The previous prime is 663893. The next prime is 663937. The reversal of 663907 is 709366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663907 - 2¹⁵ = 631139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331953 + 331954.

It is an arithmetic number, because the mean of its divisors is an integer number (331954).

2⁶⁶³⁹⁰⁷ is an apocalyptic number.

663907 is a deficient number, since it is larger than the sum of its proper divisors (1).

663907 is an equidigital number, since it uses as much as digits as its factorization.

663907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 663907 is about 814.8048846196. The cubic root of 663907 is about 87.2373402211.

The spelling of 663907 in words is "six hundred sixty-three thousand, nine hundred seven".