666746735 has 8 divisors (see below), whose sum is σ = 801671040. Its totient is φ = 532347424.

The previous prime is 666746723. The next prime is 666746761. The reversal of 666746735 is 537647666.

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

It is a cyclic number.

It is not a de Polignac number, because 666746735 - 2¹² = 666742639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128447 + ... + 133536.

It is an arithmetic number, because the mean of its divisors is an integer number (100208880).

Almost surely, 2^666746735 is an apocalyptic number.

666746735 is a deficient number, since it is larger than the sum of its proper divisors (134924305).

666746735 is a wasteful number, since it uses less digits than its factorization.

666746735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262497.

The product of its digits is 3810240, while the sum is 50.

The square root of 666746735 is about 25821.4394447715. The cubic root of 666746735 is about 873.6154364022.

The spelling of 666746735 in words is "six hundred sixty-six million, seven hundred forty-six thousand, seven hundred thirty-five".