669611309 has 4 divisors (see below), whose sum is σ = 670078080. Its totient is φ = 669144540.

The previous prime is 669611291. The next prime is 669611321. The reversal of 669611309 is 903116966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903116966 = 2 ⋅451558483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669611309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669611329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231227 + ... + 234104.

It is an arithmetic number, because the mean of its divisors is an integer number (167519520).

Almost surely, 2^669611309 is an apocalyptic number.

It is an amenable number.

669611309 is a deficient number, since it is larger than the sum of its proper divisors (466771).

669611309 is a wasteful number, since it uses less digits than its factorization.

669611309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466770.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 669611309 is about 25876.8489001269. The cubic root of 669611309 is about 874.8647666923.

The spelling of 669611309 in words is "six hundred sixty-nine million, six hundred eleven thousand, three hundred nine".