659669 has 2 divisors, whose sum is σ = 659670. Its totient is φ = 659668.

The previous prime is 659657. The next prime is 659671. The reversal of 659669 is 966956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 237169 = 650^2 + 487^2 .

It is a cyclic number.

It is not a de Polignac number, because 659669 - 2⁴ = 659653 is a prime.

It is a super-2 number, since 2×659669² = 870326379122, which contains 22 as substring.

Together with 659671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329834 + 329835.

It is an arithmetic number, because the mean of its divisors is an integer number (329835).

2⁶⁵⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

659669 is a deficient number, since it is larger than the sum of its proper divisors (1).

659669 is an equidigital number, since it uses as much as digits as its factorization.

659669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 41.

The square root of 659669 is about 812.2000984979. The cubic root of 659669 is about 87.0513195257.

The spelling of 659669 in words is "six hundred fifty-nine thousand, six hundred sixty-nine".