669677 has 2 divisors, whose sum is σ = 669678. Its totient is φ = 669676.

The previous prime is 669673. The next prime is 669679. The reversal of 669677 is 776966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376996 + 292681 = 614^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 669677 - 2² = 669673 is a prime.

Together with 669679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669677.

It is not a weakly prime, because it can be changed into another prime (669673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334838 + 334839.

It is an arithmetic number, because the mean of its divisors is an integer number (334839).

2⁶⁶⁹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

669677 is a deficient number, since it is larger than the sum of its proper divisors (1).

669677 is an equidigital number, since it uses as much as digits as its factorization.

669677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 41.

The square root of 669677 is about 818.3379497494. The cubic root of 669677 is about 87.4893374763.

The spelling of 669677 in words is "six hundred sixty-nine thousand, six hundred seventy-seven".