669834071 has 2 divisors, whose sum is σ = 669834072. Its totient is φ = 669834070.

The previous prime is 669834049. The next prime is 669834073. The reversal of 669834071 is 170438966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669834071 is a prime.

Together with 669834073, 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 (669834073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334917035 + 334917036.

It is an arithmetic number, because the mean of its divisors is an integer number (334917036).

Almost surely, 2^669834071 is an apocalyptic number.

669834071 is a deficient number, since it is larger than the sum of its proper divisors (1).

669834071 is an equidigital number, since it uses as much as digits as its factorization.

669834071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 669834071 is about 25881.1528143551. The cubic root of 669834071 is about 874.9617707379.

The spelling of 669834071 in words is "six hundred sixty-nine million, eight hundred thirty-four thousand, seventy-one".