669543911 has 4 divisors (see below), whose sum is σ = 669698592. Its totient is φ = 669389232.

The previous prime is 669543893. The next prime is 669543913. The reversal of 669543911 is 119345966.

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 669543911 - 2¹⁴ = 669527527 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 (669543913) 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, 70655 + ... + 79568.

It is an arithmetic number, because the mean of its divisors is an integer number (167424648).

Almost surely, 2^669543911 is an apocalyptic number.

669543911 is a deficient number, since it is larger than the sum of its proper divisors (154681).

669543911 is a wasteful number, since it uses less digits than its factorization.

669543911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154680.

The product of its digits is 174960, while the sum is 44.

The square root of 669543911 is about 25875.5465835990. The cubic root of 669543911 is about 874.8354132882.

The spelling of 669543911 in words is "six hundred sixty-nine million, five hundred forty-three thousand, nine hundred eleven".