669385177 has 4 divisors (see below), whose sum is σ = 682015140. Its totient is φ = 656755216.

The previous prime is 669385153. The next prime is 669385193. The reversal of 669385177 is 771583966.

669385177 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 263120841 + 406264336 = 16221^2 + 20156^2 .

It is a cyclic number.

It is not a de Polignac number, because 669385177 - 2⁷ = 669385049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669385117) 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, 6314902 + ... + 6315007.

It is an arithmetic number, because the mean of its divisors is an integer number (170503785).

Almost surely, 2^669385177 is an apocalyptic number.

It is an amenable number.

669385177 is a deficient number, since it is larger than the sum of its proper divisors (12629963).

669385177 is a wasteful number, since it uses less digits than its factorization.

669385177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12629962.

The product of its digits is 1905120, while the sum is 52.

The square root of 669385177 is about 25872.4791429040. The cubic root of 669385177 is about 874.7662731379.

The spelling of 669385177 in words is "six hundred sixty-nine million, three hundred eighty-five thousand, one hundred seventy-seven".