669406117 has 2 divisors, whose sum is σ = 669406118. Its totient is φ = 669406116.

The previous prime is 669406013. The next prime is 669406141. The reversal of 669406117 is 711604966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574752676 + 94653441 = 23974^2 + 9729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669406117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669406117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669406417) 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, 334703058 + 334703059.

It is an arithmetic number, because the mean of its divisors is an integer number (334703059).

Almost surely, 2^669406117 is an apocalyptic number.

It is an amenable number.

669406117 is a deficient number, since it is larger than the sum of its proper divisors (1).

669406117 is an equidigital number, since it uses as much as digits as its factorization.

669406117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 669406117 is about 25872.8838168458. The cubic root of 669406117 is about 874.7753946499.

The spelling of 669406117 in words is "six hundred sixty-nine million, four hundred six thousand, one hundred seventeen".