669120013 has 2 divisors, whose sum is σ = 669120014. Its totient is φ = 669120012.

The previous prime is 669119993. The next prime is 669120037. The reversal of 669120013 is 310021966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657307044 + 11812969 = 25638^2 + 3437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669120013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669120043) 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, 334560006 + 334560007.

It is an arithmetic number, because the mean of its divisors is an integer number (334560007).

Almost surely, 2^669120013 is an apocalyptic number.

It is an amenable number.

669120013 is a deficient number, since it is larger than the sum of its proper divisors (1).

669120013 is an equidigital number, since it uses as much as digits as its factorization.

669120013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 669120013 is about 25867.3541940416. The cubic root of 669120013 is about 874.6507506320.

Adding to 669120013 its reverse (310021966), we get a palindrome (979141979).

The spelling of 669120013 in words is "six hundred sixty-nine million, one hundred twenty thousand, thirteen".