669273217 has 4 divisors (see below), whose sum is σ = 685596996. Its totient is φ = 652949440.

The previous prime is 669273211. The next prime is 669273247. The reversal of 669273217 is 712372966.

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 174477681 + 494795536 = 13209^2 + 22244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669273217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669273211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8161828 + ... + 8161909.

It is an arithmetic number, because the mean of its divisors is an integer number (171399249).

Almost surely, 2^669273217 is an apocalyptic number.

It is an amenable number.

669273217 is a deficient number, since it is larger than the sum of its proper divisors (16323779).

669273217 is a wasteful number, since it uses less digits than its factorization.

669273217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16323778.

The product of its digits is 190512, while the sum is 43.

The square root of 669273217 is about 25870.3153633658. The cubic root of 669273217 is about 874.7174998774.

The spelling of 669273217 in words is "six hundred sixty-nine million, two hundred seventy-three thousand, two hundred seventeen".