666754 has 8 divisors (see below), whose sum is σ = 1091088. Its totient is φ = 303060.

The previous prime is 666751. The next prime is 666769. The reversal of 666754 is 457666.

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

It is not an unprimeable number, because it can be changed into a prime (666751) 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 in 3 ways as a sum of consecutive naturals, for example, 15132 + ... + 15175.

It is an arithmetic number, because the mean of its divisors is an integer number (136386).

2⁶⁶⁶⁷⁵⁴ is an apocalyptic number.

666754 is a deficient number, since it is larger than the sum of its proper divisors (424334).

666754 is a wasteful number, since it uses less digits than its factorization.

666754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30320.

The product of its digits is 30240, while the sum is 34.

The square root of 666754 is about 816.5500597024. The cubic root of 666754 is about 87.3618609418.

The spelling of 666754 in words is "six hundred sixty-six thousand, seven hundred fifty-four".