669625559 has 2 divisors, whose sum is σ = 669625560. Its totient is φ = 669625558.

The previous prime is 669625543. The next prime is 669625601. The reversal of 669625559 is 955526966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669625559 - 2⁴ = 669625543 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669625559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669625459) 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, 334812779 + 334812780.

It is an arithmetic number, because the mean of its divisors is an integer number (334812780).

Almost surely, 2^669625559 is an apocalyptic number.

669625559 is a deficient number, since it is larger than the sum of its proper divisors (1).

669625559 is an equidigital number, since it uses as much as digits as its factorization.

669625559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374000, while the sum is 53.

The square root of 669625559 is about 25877.1242413063. The cubic root of 669625559 is about 874.8709726481.

The spelling of 669625559 in words is "six hundred sixty-nine million, six hundred twenty-five thousand, five hundred fifty-nine".