669771 has 6 divisors (see below), whose sum is σ = 967460. Its totient is φ = 446508.

The previous prime is 669763. The next prime is 669787. The reversal of 669771 is 177966.

It is not a de Polignac number, because 669771 - 2³ = 669763 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669771.

It is not an unprimeable number, because it can be changed into a prime (669701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37201 + ... + 37218.

2⁶⁶⁹⁷⁷¹ is an apocalyptic number.

669771 is a deficient number, since it is larger than the sum of its proper divisors (297689).

669771 is a wasteful number, since it uses less digits than its factorization.

669771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74425 (or 74422 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 669771 is about 818.3953812186. The cubic root of 669771 is about 87.4934307993.

The spelling of 669771 in words is "six hundred sixty-nine thousand, seven hundred seventy-one".