669645341 has 2 divisors, whose sum is σ = 669645342. Its totient is φ = 669645340.

The previous prime is 669645323. The next prime is 669645343. The reversal of 669645341 is 143546966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565012900 + 104632441 = 23770^2 + 10229^2 .

It is a cyclic number.

It is not a de Polignac number, because 669645341 - 2¹⁴ = 669628957 is a prime.

Together with 669645343, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 669645292 and 669645301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669645343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334822670 + 334822671.

It is an arithmetic number, because the mean of its divisors is an integer number (334822671).

Almost surely, 2^669645341 is an apocalyptic number.

It is an amenable number.

669645341 is a deficient number, since it is larger than the sum of its proper divisors (1).

669645341 is an equidigital number, since it uses as much as digits as its factorization.

669645341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 669645341 is about 25877.5064679733. The cubic root of 669645341 is about 874.8795876752.

The spelling of 669645341 in words is "six hundred sixty-nine million, six hundred forty-five thousand, three hundred forty-one".