666735 has 8 divisors (see below), whose sum is σ = 1066800. Its totient is φ = 355584.

The previous prime is 666733. The next prime is 666737. The reversal of 666735 is 537666.

It is an interprime number because it is at equal distance from previous prime (666733) and next prime (666737).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666735 - 2¹ = 666733 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

666735 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 666696 and 666705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22210 + ... + 22239.

It is an arithmetic number, because the mean of its divisors is an integer number (133350).

2⁶⁶⁶⁷³⁵ is an apocalyptic number.

666735 is a deficient number, since it is larger than the sum of its proper divisors (400065).

666735 is a wasteful number, since it uses less digits than its factorization.

666735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44457.

The product of its digits is 22680, while the sum is 33.

The square root of 666735 is about 816.5384253053. The cubic root of 666735 is about 87.3610311049.

The spelling of 666735 in words is "six hundred sixty-six thousand, seven hundred thirty-five".