669388567 has 4 divisors (see below), whose sum is σ = 677861920. Its totient is φ = 660915216.

The previous prime is 669388553. The next prime is 669388589. The reversal of 669388567 is 765883966.

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 669388567 - 2¹¹ = 669386519 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 (669388547) 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, 4236558 + ... + 4236715.

It is an arithmetic number, because the mean of its divisors is an integer number (169465480).

Almost surely, 2^669388567 is an apocalyptic number.

669388567 is a deficient number, since it is larger than the sum of its proper divisors (8473353).

669388567 is an equidigital number, since it uses as much as digits as its factorization.

669388567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8473352.

The product of its digits is 13063680, while the sum is 58.

The square root of 669388567 is about 25872.5446564500. The cubic root of 669388567 is about 874.7677498426.

The spelling of 669388567 in words is "six hundred sixty-nine million, three hundred eighty-eight thousand, five hundred sixty-seven".