666670 has 16 divisors (see below), whose sum is σ = 1210320. Its totient is φ = 264384.

The previous prime is 666667. The next prime is 666671. The reversal of 666670 is 76666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1426 + ... + 1834.

It is an arithmetic number, because the mean of its divisors is an integer number (75645).

2⁶⁶⁶⁶⁷⁰ is an apocalyptic number.

666670 is a deficient number, since it is larger than the sum of its proper divisors (543650).

666670 is a wasteful number, since it uses less digits than its factorization.

666670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 666670 is about 816.4986221666. The cubic root of 666670 is about 87.3581920701.

The spelling of 666670 in words is "six hundred sixty-six thousand, six hundred seventy".