669535673 has 4 divisors (see below), whose sum is σ = 692623140. Its totient is φ = 646448208.

The previous prime is 669535663. The next prime is 669535693. The reversal of 669535673 is 376535966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 376535966 = 2 ⋅188267983.

It can be written as a sum of positive squares in 2 ways, for example, as 462981289 + 206554384 = 21517^2 + 14372^2 .

It is a cyclic number.

It is not a de Polignac number, because 669535673 - 2¹⁴ = 669519289 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 (669535663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11543690 + ... + 11543747.

It is an arithmetic number, because the mean of its divisors is an integer number (173155785).

Almost surely, 2^669535673 is an apocalyptic number.

It is an amenable number.

669535673 is a deficient number, since it is larger than the sum of its proper divisors (23087467).

669535673 is a wasteful number, since it uses less digits than its factorization.

669535673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23087466.

The product of its digits is 3061800, while the sum is 50.

The square root of 669535673 is about 25875.3873980661. The cubic root of 669535673 is about 874.8318253116.

The spelling of 669535673 in words is "six hundred sixty-nine million, five hundred thirty-five thousand, six hundred seventy-three".