666697670 has 64 divisors (see below), whose sum is σ = 1301702400. Its totient is φ = 244930560.

The previous prime is 666697663. The next prime is 666697741. The reversal of 666697670 is 76796666.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2478296 + ... + 2478564.

It is an arithmetic number, because the mean of its divisors is an integer number (20339100).

Almost surely, 2^666697670 is an apocalyptic number.

666697670 is a deficient number, since it is larger than the sum of its proper divisors (635004730).

666697670 is a wasteful number, since it uses less digits than its factorization.

666697670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 3429216, while the sum is 53.

The square root of 666697670 is about 25820.4893447045. The cubic root of 666697670 is about 873.5940064796.

The spelling of 666697670 in words is "six hundred sixty-six million, six hundred ninety-seven thousand, six hundred seventy".