669343919 has 4 divisors (see below), whose sum is σ = 669430944. Its totient is φ = 669256896.

The previous prime is 669343859. The next prime is 669343931. The reversal of 669343919 is 919343966.

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

It is a cyclic number.

It is not a de Polignac number, because 669343919 - 2¹² = 669339823 is a prime.

It is a super-2 number, since 2×669343919² = 896042563804557122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669346919) 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, 30722 + ... + 47775.

It is an arithmetic number, because the mean of its divisors is an integer number (167357736).

Almost surely, 2^669343919 is an apocalyptic number.

669343919 is a deficient number, since it is larger than the sum of its proper divisors (87025).

669343919 is an equidigital number, since it uses as much as digits as its factorization.

669343919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87024.

The product of its digits is 944784, while the sum is 50.

The square root of 669343919 is about 25871.6817968991. The cubic root of 669343919 is about 874.7483005019.

The spelling of 669343919 in words is "six hundred sixty-nine million, three hundred forty-three thousand, nine hundred nineteen".