668737 has 2 divisors, whose sum is σ = 668738. Its totient is φ = 668736.

The previous prime is 668719. The next prime is 668741. The reversal of 668737 is 737866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 163216 = 711^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 668737 - 2⁷ = 668609 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 668696 and 668705.

It is not a weakly prime, because it can be changed into another prime (668747) by changing a digit.

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 as a sum of consecutive naturals, namely, 334368 + 334369.

It is an arithmetic number, because the mean of its divisors is an integer number (334369).

2⁶⁶⁸⁷³⁷ is an apocalyptic number.

It is an amenable number.

668737 is a deficient number, since it is larger than the sum of its proper divisors (1).

668737 is an equidigital number, since it uses as much as digits as its factorization.

668737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 668737 is about 817.7634132193. The cubic root of 668737 is about 87.4483831623.

It can be divided in two parts, 6687 and 37, that added together give a square (6724 = 82²).

The spelling of 668737 in words is "six hundred sixty-eight thousand, seven hundred thirty-seven".