666737 has 2 divisors, whose sum is σ = 666738. Its totient is φ = 666736.

The previous prime is 666733. The next prime is 666749. The reversal of 666737 is 737666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 87616 = 761^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 666737 - 2² = 666733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666697 and 666706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333368 + 333369.

It is an arithmetic number, because the mean of its divisors is an integer number (333369).

2⁶⁶⁶⁷³⁷ is an apocalyptic number.

It is an amenable number.

666737 is a deficient number, since it is larger than the sum of its proper divisors (1).

666737 is an equidigital number, since it uses as much as digits as its factorization.

666737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 35.

The square root of 666737 is about 816.5396499865. The cubic root of 666737 is about 87.3611184569.

The spelling of 666737 in words is "six hundred sixty-six thousand, seven hundred thirty-seven".