556668405 has 12 divisors (see below), whose sum is σ = 964891980. Its totient is φ = 296889792.

The previous prime is 556668391. The next prime is 556668407. The reversal of 556668405 is 504866655.

It is a happy number.

556668405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 398361681 + 158306724 = 19959^2 + 12582^2 .

It is not a de Polignac number, because 556668405 - 2¹⁸ = 556406261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 12370409 = 556668405 / (5 + 5 + 6 + 6 + 6 + 8 + 4 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556668407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6185160 + ... + 6185249.

It is an arithmetic number, because the mean of its divisors is an integer number (80407665).

Almost surely, 2^556668405 is an apocalyptic number.

It is an amenable number.

556668405 is a deficient number, since it is larger than the sum of its proper divisors (408223575).

556668405 is a wasteful number, since it uses less digits than its factorization.

556668405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12370420 (or 12370417 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The square root of 556668405 is about 23593.8213310180. The cubic root of 556668405 is about 822.6192298893.

The spelling of 556668405 in words is "five hundred fifty-six million, six hundred sixty-eight thousand, four hundred five".