666733 has 2 divisors, whose sum is σ = 666734. Its totient is φ = 666732.

The previous prime is 666727. The next prime is 666737. The reversal of 666733 is 337666.

666733 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 29929 = 798^2 + 173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666733 is a prime.

666733 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 666695 and 666704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333366 + 333367.

It is an arithmetic number, because the mean of its divisors is an integer number (333367).

2⁶⁶⁶⁷³³ is an apocalyptic number.

It is an amenable number.

666733 is a deficient number, since it is larger than the sum of its proper divisors (1).

666733 is an equidigital number, since it uses as much as digits as its factorization.

666733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 31.

The square root of 666733 is about 816.5372006222. The cubic root of 666733 is about 87.3609437527.

The spelling of 666733 in words is "six hundred sixty-six thousand, seven hundred thirty-three".