555555609 has 24 divisors (see below), whose sum is σ = 932148672. Its totient is φ = 312253920.

The previous prime is 555555599. The next prime is 555555643. The reversal of 555555609 is 906555555.

It is not a de Polignac number, because 555555609 - 2¹⁷ = 555424537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (555555109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68439 + ... + 76124.

It is an arithmetic number, because the mean of its divisors is an integer number (38839528).

Almost surely, 2^555555609 is an apocalyptic number.

It is an amenable number.

555555609 is a deficient number, since it is larger than the sum of its proper divisors (376593063).

555555609 is a wasteful number, since it uses less digits than its factorization.

555555609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144637 (or 144634 counting only the distinct ones).

The product of its (nonzero) digits is 843750, while the sum is 45.

The square root of 555555609 is about 23570.2271732794. The cubic root of 555555609 is about 822.0707178046.

The spelling of 555555609 in words is "five hundred fifty-five million, five hundred fifty-five thousand, six hundred nine".