670666673 has 4 divisors (see below), whose sum is σ = 693793140. Its totient is φ = 647540208.

The previous prime is 670666631. The next prime is 670666687. The reversal of 670666673 is 376666076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 472758049 + 197908624 = 21743^2 + 14068^2 .

It is a cyclic number.

It is not a de Polignac number, because 670666673 - 2¹⁰ = 670665649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (670666273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11563190 + ... + 11563247.

It is an arithmetic number, because the mean of its divisors is an integer number (173448285).

Almost surely, 2^670666673 is an apocalyptic number.

It is an amenable number.

670666673 is a deficient number, since it is larger than the sum of its proper divisors (23126467).

670666673 is a wasteful number, since it uses less digits than its factorization.

670666673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23126466.

The product of its (nonzero) digits is 1143072, while the sum is 47.

The square root of 670666673 is about 25897.2329216849. The cubic root of 670666673 is about 875.3241457006.

The spelling of 670666673 in words is "six hundred seventy million, six hundred sixty-six thousand, six hundred seventy-three".