556646121 has 16 divisors (see below), whose sum is σ = 840222720. Its totient is φ = 364094640.

The previous prime is 556646119. The next prime is 556646171. The reversal of 556646121 is 121646655.

556646121 is a `hidden beast` number, since 5 + 5 + 6 + 646 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 556646121 - 2¹ = 556646119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556646171) 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 in 15 ways as a sum of consecutive naturals, for example, 193065 + ... + 195926.

It is an arithmetic number, because the mean of its divisors is an integer number (52513920).

Almost surely, 2^556646121 is an apocalyptic number.

It is an amenable number.

556646121 is a deficient number, since it is larger than the sum of its proper divisors (283576599).

556646121 is a wasteful number, since it uses less digits than its factorization.

556646121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389053 (or 389047 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 556646121 is about 23593.3490840109. The cubic root of 556646121 is about 822.6082529825.

The spelling of 556646121 in words is "five hundred fifty-six million, six hundred forty-six thousand, one hundred twenty-one".