663937 has 2 divisors, whose sum is σ = 663938. Its totient is φ = 663936.

The previous prime is 663907. The next prime is 663959. The reversal of 663937 is 739366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531441 + 132496 = 729^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 663937 - 2¹¹ = 661889 is a prime.

It is not a weakly prime, because it can be changed into another prime (663907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331968 + 331969.

It is an arithmetic number, because the mean of its divisors is an integer number (331969).

2⁶⁶³⁹³⁷ is an apocalyptic number.

It is an amenable number.

663937 is a deficient number, since it is larger than the sum of its proper divisors (1).

663937 is an equidigital number, since it uses as much as digits as its factorization.

663937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 34.

The square root of 663937 is about 814.8232937269. The cubic root of 663937 is about 87.2386542007.

It can be divided in two parts, 663 and 937, that added together give a square (1600 = 40²).

The spelling of 663937 in words is "six hundred sixty-three thousand, nine hundred thirty-seven".