669405371 has 2 divisors, whose sum is σ = 669405372. Its totient is φ = 669405370.

The previous prime is 669405353. The next prime is 669405391. The reversal of 669405371 is 173504966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669405371 - 2¹⁰ = 669404347 is a prime.

It is not a weakly prime, because it can be changed into another prime (669405391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334702685 + 334702686.

It is an arithmetic number, because the mean of its divisors is an integer number (334702686).

Almost surely, 2^669405371 is an apocalyptic number.

669405371 is a deficient number, since it is larger than the sum of its proper divisors (1).

669405371 is an equidigital number, since it uses as much as digits as its factorization.

669405371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 669405371 is about 25872.8694002038. The cubic root of 669405371 is about 874.7750696939.

The spelling of 669405371 in words is "six hundred sixty-nine million, four hundred five thousand, three hundred seventy-one".